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Boost Your Cardio Performance With These Easy Steps

2nd February 2023

2nd February 2023

By Robyn Schaffer

Cardio training is one of the most popular forms of exercise, and experts recommend getting at least 150 minutes of moderate aerobic exercise, or 75 minutes of vigorous activity each week. 

Whether it’s running, cycling, skipping, or HIIT classes, the variety of options means there’s something for everyone. There's a plethora of health benefits when it comes to cardio, so it’s important to try and get some into your fitness routine.

How to get better at cardio 

If you’re not used to cardio-style workouts, it can be hard to know where to start when it comes to improving your performance. Alternatively, if you’ve been doing cardio for a while now and want to take it up a notch, it can be just as difficult to know how to really boost your performance.

Cardio of benefits 

The benefits of doing regular cardio are well-documented and near endless. They include:

With that in mind, we’ve put together a list of some top tips anyone can adopt to seriously set their cardio training in motion. Whether you’re a beginner or a total pro, these easy steps could be the key to transforming your fitness routine.

How to boost cardio endurance 

  • Set gradual, achievable targets

No one's a professional at anything from the off, so don’t expect to be able to run a marathon within weeks of starting to boost your cardio training. Increase the intensity of your workouts slowly; muscles and joints take longer to adapt to the stress of exercise than your heart and lungs. If you're running or cycling, don’t increase your time or distance by more than 10-20% each week, in order to avoid injury.

So, if you start out with 10 minutes of exercise, add on one or two minutes each time for the first few weeks before making your progressions slightly larger.

It’s also a good idea to keep a journal or diary where you can record and keep track of your fitness goals and achievements. You can either write these down on paper, or use a fitness app to help you.

Apps can help you track your steps, heart rate, nutrition and more, so if you’re looking to take your cardio training that bit more seriously, it’s a no-brainer. You can see the results in front of your eyes. There have even been studies that have shown that smartphone apps and exercise trackers can help improve fitness.

What the Innermost Insiders say:

“I’d advise anyone looking to improve their cardio performance to set themselves little targets. Preparing for the London Marathon, I would run one short run (e.g. two miles) and one longer run per week (e.g. six miles), giving myself enough time to recover between the runs. With practice, and after a couple of months, they both became six miles, and then 10 to 15  miles.” - Zack Seamons

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On your marks. Get set. SMILE 😁😂

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  • Interval training

Interval training has been used for years by athletes looking to improve and build upon their fitness. It usually entails combining short, high-intensity bursts of speed with slow recovery phases, and doing this in alternation throughout one exercise session. Essentially, interval training can help you boost your cardio performance by working both the aerobic and anaerobic systems.

During periods of high-intensity (such as during interval training), the anaerobic system uses the energy stored in the muscles (glycogen) for short bursts of activity. The anaerobic metabolism is able to work without oxygen, however the by-product created is lactic acid.

As lactic acid builds, we enter what’s known as ‘oxygen debt’, and it’s during the recovery phase that our heart and lungs work together to ‘pay back’ this oxygen debt and break down the lactic acid. It’s in this phase that the aerobic system is using oxygen to convert stored carbohydrates into energy.

Ultimately, it's thought that by doing high-intensity intervals that produce lactic acid, the body learns to adapt and burn lactic acid more efficiently during exercise, hence improving our performance during cardio. 

In addition, here are some of the several other benefits of interval training:

  • More calories burned. If you’re looking to lose body fat, intervals are more effective than long, slow endurance exercise. The effort you have to put in means your body will have to work harder to recover, so you’ll burn more calories in the 24 hours after a session of interval training than you would after a long, slow, steady run.
  • A healthier heart. Did you know HIIT can actually decrease strain on your heart? Over time, cardio exercise can increase your heart stroke volume, making your heart stronger and more efficient. This can also decrease your risk of both heart disease and high blood pressure. 

What the Innermost Insiders say:

“For me, I try to change it up each session so as to not stagnate my cardio training. So if I go for a long run on Monday, I’ll do interval training on Tuesday, just to make sure you're shocking the body and not making it get used to a specific exercise.” - Darren Placid

 

  • Combine cardio with strength training

Life is all about balance. So even if your main fitness goal is to boost your cardio performance, it’s important to switch things up every now and again, and combining cardio with strength training can actually help you reach those goals in the long run. Strength training helps our muscles become stronger and more powerful, making us ready for those intense cardio sessions. But, it can even help reduce the chances of health problems like osteoporosis, and the symptoms of things like diabetes, obesity, and back pain. But beyond that, it’s good for you mentally too. Researchers have found that strength training can improve brain cognition, reduce anxiety and depression, and boost self-esteem.

Try this easy-to-follow strength and cardio workout from Whole Life Challenge to get you started.

It’s easiest to do this one if you have access to a treadmill in a gym, but any outside space will do perfectly too.

  • 5-minute warm up walk
  • 90-second jog
  • 30-second sprint 
  • 10 press-ups 
  • 10 bodyweight squats
  • 90-second jog
  • 30-second sprint
  • 20 walking lunges (10 each side)
  • 60-second plank
  • 20 mountain climbers
  • 90-second jog
  • 30-second spring
  • 10 burpees
  • 60-second wall sit
  • 10 squat jumps
  • 90-second jog
  • 30-second sprint
  • 5-minute cool down walk
  • Make time to rest and recover

Even though the cardio training itself is what we’re focusing on here, rest and recovery is just as crucial to the process of boosting your performance. Proper rest and recovery allows your muscles to repair themselves so they’re well-prepared and stronger for your next session. If you over train and tire yourself out, it can actually end up having the adverse effect and increase chances of strain and injury.

Here’s some of the best ways you can recover post-workout to ensure your cardio performance is at its best:

  • Rest. No, really. You can boost your performance just by sleeping. Sleep is one of the most important factors in our health and fitness, and getting the right amount of quality sleep is crucial to efficient recovery.
  • Hydrate. Drink plenty of water throughout the day after your workout to replace all the minerals and nutrients lost through sweat. And if you’re looking to really maximise your recovery, try The Power Booster. Containing creatine monohydrate (one of the most popular sports supplements in the world which increases power, strength and speed), it’s perfect for after high-intensity training.
  • Stretch. Stretching helps the muscles stay strong and supple, minimising the chances of tightness and injury. Having a hot shower or bath before stretching can also help loosen the muscles even more prior to stretching.

Looking for some inspiration? Check out these nine easy stretching exercises.

  • Fuel your body properly

Without proper fuel, our bodies simply cannot perform at their best. However, sometimes it can be hard to know what our bodies need at which moments. And different types of exercise can require different types of fuel. Barbara Lewin, RD, a sports nutritionist who works with professional athletes, told Health.com: “What’s healthy on a regular basis is not necessarily a good choice for the race course, or even for a workout.”

So for cardio, when you eat is just as important as what. It’s recommended to have a pre-workout meal that’s low in fat and sugar, moderate in protein, and high in carbs. So something like a protein smoothie made with berries about 60 to 90 minutes before you workout would be perfect. This ensures you’ve digested the food properly, while the high-carb content will provide you with enough energy to power you through the session. About 20-30 minutes after your workout, in your body’s ‘metabolic window’, opt for a carb and protein-heavy snack. The protein will help rebuild muscles, while the carbs will replace muscle glycogen stores and replenish energy.

Examples of some snacks you could have include things like:

  • A protein shake with fruit. Try one of our Innermost proteins to get all the post-workout goods you need.
  • Greek yoghurt with berries.
  • A bagel with eggs.

What the Innermost Insiders say:

“I always make sure there’s enough energy in the tank. One of my biggest runs (20 miles in two hours and 20 minutes) was actually completed shortly after an Easter Sunday family meal. Eat light, allow time to digest, and don’t run on empty. I’d also advise eating clean, no fatty foods, no carbonated drinks, and little to no alcohol.” - Zack Seamons

Summary

Think you're a bit more clued up on how to boost your cardio endurance, now? If you try out any of these hacks for boosting your cardio training and performance, let us know, We’d love to hear from you!

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Magnesium for Sleep: Here's What You Need to Know
  Sleep is one of the most important parts of the day. Feeling well, training well and moving through the day with enough energy to actually enjoy it, all rely on a good night’s sleep. Yet for many of us, it is also one of the first things to suffer when life gets busy. Late nights. Early starts. Stress. Screens. Training sessions squeezed into already full days. A mind that seems to become suddenly very active the moment your head hits the pillow. It is no surprise, then, that magnesium has become one of the most talked-about supplements for sleep. It is often linked with relaxation, recovery and the ability to switch off at night. But as with most things in wellness, the real answer is a little more nuanced than “take this and sleep better”. So, does research suggest that magnesium helps with sleep? And how do you know whether it is right for you? Let’s take a closer look. Key takeaways Magnesium supports several normal processes linked with rest, including muscle function, nervous system function and energy metabolism. Magnesium may help some people sleep better, particularly where poor sleep is connected to stress, low magnesium intake, muscle tension or poor recovery. Food should always be the foundation, but magnesium supplements can help support a consistent intake when busy lifestyles, training and irregular meals get in the way. Magnesium works best as part of a broader evening routine, alongside sensible caffeine timing, reduced evening stimulation, good nutrition and proper recovery. What is magnesium and why is it linked to sleep Magnesium is an essential mineral found in food, water and supplements that is involved in over 300 bodily processes. It acts as a mandatory helper molecule (coenzyme) for your cells. Some of the key biological functions of magnesium include: Supports energy production by helping the body convert food into usable cellular energy. Contributes to normal muscle function, including the balance between muscle contraction and relaxation. Supports normal nervous system function by helping regulate nerve signalling and neurotransmitter activity. Contributes to normal bone structure, with a significant proportion of the body’s magnesium stored in bone. Supports normal glucose metabolism, with magnesium involved in blood glucose control and insulin-related processes. While by no means an exhaustive list, this gives a wider sense of how widely it is used throughout the body. Magnesium’s connection with sleep comes from the way it supports systems involved in relaxation and recovery. As highlighted, magnesium helps regulate nerve signalling and muscle contraction, which is one reason it is often associated with calmness, reduced tension and post-training recovery. It is also commonly discussed in relation to GABA (or gamma-aminobutyric acid), a neurotransmitter involved in calming nervous system activity. While the relationship between magnesium and sleep is still being studied, the general theory is that healthy magnesium levels may help the body and brain shift away from a heightened, alert state and towards a more relaxed one. This matters because good sleep rarely begins the moment you get into bed. It starts earlier, as your body and mind begin to downshift. For active, busy people, this can be one of the hardest parts of the day. If your evening routine looks like finishing work, replying to messages, doing a late workout, eating quickly and then expecting your brain to instantly power down, you are asking a lot from your body. Magnesium may support the relaxation side of that process, but it works best when the rest of your routine is helping too. Does magnesium help you sleep? Magnesium may help some people sleep better, but it is not a guaranteed solution for everyone. Its value sits more in supporting the body’s normal relaxation and recovery processes than acting like a direct sleep aid. A 2021 systematic review and meta-analysis published in BMC Complementary Medicine and Therapies looked at oral magnesium supplementation for insomnia in older adults. It found that magnesium may help reduce the time it takes to fall asleep. While the results were promising, the sample size was limited. Magnesium is most likely to be helpful when poor sleep is linked to factors such as low magnesium intake, stress, muscle tension, a busy nervous system or poor recovery. Someone who trains several times a week, works long days and struggles to wind down at night may find it more beneficial for sleep specifically than someone whose sleep issue is caused by an untreated medical condition, severe anxiety, chronic insomnia or an inconsistent sleep schedule. It is also worth remembering that “better sleep” can mean different things to different people. Some people want to fall asleep faster. Others wake up during the night. Some sleep for eight hours but still wake feeling flat.  Magnesium is usually discussed in relation to relaxation and sleep onset, rather than acting as a powerful sleep aid that forces deeper or longer sleep. A helpful way to think about it is this: magnesium supports the conditions that may make good sleep more likely. It does not replace the foundations of sleep itself (many of which we have discussed before). Can You Get Magnesium from Food? Yes, and this is a good place to start. Magnesium is found in a range of everyday foods, including: leafy green vegetables, nuts, seeds, legumes, wholegrains and dark chocolate. Pumpkin seeds, almonds, spinach, black beans and wholegrain products are all useful sources. Food Why it helps Pumpkin seeds Naturally rich in magnesium and easy to add to meals or snacks Almonds and cashews Useful sources of magnesium, healthy fats and plant-based protein Spinach and leafy greens Provide magnesium alongside fibre and other micronutrients Black beans and lentils Support magnesium intake while also adding fibre and slow-release carbohydrates Wholegrains A practical everyday source of magnesium and sustained energy Dark chocolate Contains magnesium, although best enjoyed as part of a balanced diet   A food-first approach also supports the bigger picture. Your body does not experience nutrients in isolation. A diet rich in magnesium-containing foods is often also higher in fibre, plant compounds and other micronutrients that support overall wellbeing. That said, busy lives do not always make consistent nutrition easy. Active people may also pay closer attention to magnesium because of its role in muscle function, energy metabolism and recovery. If you train regularly, sweat heavily, experience muscle tension or find yourself relying on convenience meals during busy weeks, your magnesium intake may be worth looking at. This is where effective supplementation can help, especially when it forms part of a wider routine rather than replacing a balanced diet. Where magnesium supplements can help Food should always be the foundation, but supplements can make magnesium intake easier to manage when life is busy. Rather than trying to rebuild your diet overnight, the right supplement can help you add consistent support around the routines you already have: morning training, post-workout recovery, evening wind-downs, or busy workdays where meals are not always as balanced as you would like. With Innermost, magnesium is included as part of wider, goal-led formulations rather than as a standalone quick fix. The Fit Protein contains 250mg of magnesium per serving, alongside vegan protein, maca, rhodiola root, cocomineral and Pink Himalayan sea salt, making it well suited to active lifestyles where performance, energy and recovery all matter. The Strong Protein contains 200mg of magnesium per serving, alongside protein, casein, creatine monohydrate, Montmorency cherries and bilberries. This makes magnesium part of a broader strength and recovery blend, supporting people who train regularly and want their nutrition to work harder around their goals. For evening recovery, The Recover Capsules are another good supplementation option, with magnesium included as part of a wider recovery-focused formula. This makes them a natural fit for people who want to support recovery at the end of the day, particularly when sleep, training and overall performance are closely connected. When should you take magnesium for sleep? Magnesium works best when it becomes part of a routine you can actually stick to. Because magnesium supports relaxation and recovery rather than acting as a sedative, timing does not need to be overly complicated. The most effective approach is usually the one you can repeat consistently. For many people, magnesium fits naturally into the evening. That might mean taking it with dinner, after training, or as part of a wider wind-down routine before bed. The aim is not to wait until you feel wired and then expect magnesium to force sleep. It is to give your body steady support at the point in the day when you want to start slowing down. This is particularly relevant if your days are busy or training-focused. When your body has been under physical or mental demand, sleep is part of the recovery process. Magnesium can support that bigger picture by contributing to normal muscle function, nervous system function and energy metabolism. Final thoughts: magnesium, sleep and recovery Magnesium has earned its place in the sleep conversation, but it deserves to be understood properly. It is an essential mineral with important roles in muscle function, nervous system function and recovery. For some people, particularly those who are active, stressed, low in magnesium-rich foods or struggling to wind down at night, supplementation may be a useful addition to an evening routine. The key is to keep expectations realistic. Magnesium is not a shortcut to perfect sleep. It is a supportive tool that works best alongside consistent habits: sensible caffeine timing, less evening stimulation, good nutrition, proper recovery and a calm bedtime routine. For Innermost, the bigger point is that form matters, but formulation matters too. Magnesium works best when it fits into a wider routine. That might mean supporting your intake through a recovery-focused product, taking supplements with food, and using them consistently rather than expecting an instant effect. References  Magnesium. National Institute for Health Professionals. Click here. Jewett, E., Sharma, S (2023). Physiology, GABA. National Library of Medicine. Click here. Mah, J., Pitre, T (2021).Oral magnesium supplementation for insomnia in older adults: a Systematic Review & Meta-Analysis. BMC Complementary Medicine and Therapies. Click here. Read more
Fibre
Within the fitness space there can be a tendency to think of fibre as something that’s just functional. Important, of course, but often its impact is only framed around digestion. In reality, fibre plays a far broader role in how your body performs and how you feel day to day, influencing variables like energy stability and appetite regulation through to long-term metabolic health. For anyone already investing in their training, recovery, and overall wellbeing, a high fibre diet matters more than you might think. It’s one of the simplest ways to bring more consistency to your nutrition, without adding complexity. In this guide, we’ll take a closer look at what fibre does, why it matters, and how to build a high fibre diet in a way that fits naturally into your routine. What is fibre and why it matters Fibre is a type of carbohydrate that is naturally sourced from foods like wholegrains, beans, nuts and more. At its core, dietary fibre is the part of plant foods your body can’t fully digest. Rather than being absorbed, it moves through the digestive system, interacting with everything along the way. This process is what makes fibre so valuable. It slows digestion, supports beneficial gut bacteria, and helps regulate how nutrients enter the bloodstream. Over time, these effects compound, influencing energy levels, hunger signals, and metabolic health. It’s worth understanding that fibre isn’t one single thing, and while it is often grouped together, different types have different roles. Broadly, fibre falls into two categories: Soluble fibre: This dissolves in water and forms a gel-like substance, helping to slow digestion and regulate blood sugar and cholesterol. Insoluble fibre: This adds bulk and supports regular movement through the digestive system. Most whole foods contain a combination of both, which is why variety matters more than focusing on a single source. Why intake is often lower than expected You might read this and think you’re easily hitting your daily fibre requirements. Yet, even among people who eat relatively well, fibre intake tends to fall short. In the UK, the recommendation sits at around 30g per day, yet average intake is closer to 18–20g. This isn’t usually down to poor habits. More often, it reflects modern eating patterns: A strong focus on high-protein meals can reduce the variety of plant foods in a diet, lowering fibre intake over time. A reliance on staples like white bread and pasta contain less fibre than wholegrain alternatives, making fibre intake harder to reach. Quick, convenient meals often lack the whole ingredients needed to support adequate fibre intake. The result isn’t a complete absence of fibre, but it does lead to a gradual shortfall below the 30g recommendations. Each meal might seem balanced in isolation, but across a full day or week, intake consistently sits below where it needs to be. The Key Benefits of a High Fibre Diet  A high fibre diet supports several key areas of health at the same time: Gut health and microbiome support As previously mentioned, fibre’s most recognised role is in digestion, but its impact actually goes deeper than that. Certain fibres act as prebiotics, feeding beneficial gut bacteria. These bacteria produce compounds known as short-chain fatty acids (SCFAs), including butyrate, which plays a role in maintaining the integrity of the gut lining and regulating inflammation. A 2019 review published in The Lancet found that higher dietary fibre intake was consistently associated with improved gut health markers and reduced risk of several chronic conditions. The key takeaway wasn’t a single “superfood”, but the cumulative effect of consistent fibre intake over time. There’s also increasing interest in how microbiome diversity influences overall health. A more varied intake of fibre tends to support a more diverse gut environment, which is linked to better resilience and function. For those looking to improve their training routines and hit new PBs, a well-functioning gut is central to recovery. This is because fibre supports the gut environment, which in turn affects how efficiently nutrients are absorbed. More stable energy levels When it comes to your energy, it isn’t just about calorie intake. It’s also key to ensure your body can effectively process these calories. This is where fibre can be highly beneficial. This is because fibre slows the digestion of other carbohydrates, leading to a more gradual release of glucose into the bloodstream. This helps avoid the sharp spikes and dips that can come from highly refined meals. Studies also show that diets higher in fibre are associated with improved glycaemic control, even in otherwise healthy individuals. In practical terms, this often leads to: More consistent energy across the day Fewer mid-afternoon crashes Reduced reliance on quick fixes like sugar or caffeine For those balancing work, training, and recovery, the more stable blood sugar levels provided by fibre mean more consistent energy availability. This can translate into better training sessions, particularly for longer or more demanding workouts. Appetite regulation High fibre foods tend to be more filling due to their volume and slower digestion. At the same time, they influence hormones involved in hunger and fullness, including ghrelin and peptide YY. There’s also a hormonal aspect to this. Fibre-rich foods can influence the release of satiety hormones, helping your body better recognise when it’s full. This creates a more sustainable approach to body composition. Instead of relying on weight loss restriction, your diet supports appetite regulation more naturally. Heart Health and Long-Term Outcomes In addition to the shorter-term health and wellness benefits, fibre intake also has a beneficial impact on long-term health. Soluble fibre, in particular, has been shown to help reduce LDL cholesterol by binding to cholesterol in the digestive system and aiding its removal. Large cohort studies have consistently linked higher fibre intake with a reduced risk of cardiovascular disease and type 2 diabetes. This is partly due to improved blood sugar regulation and partly due to the broader metabolic benefits of a fibre-rich diet. One study in particular by the BMJ found that each additional 7g of fibre per day was associated with a 9% reduction in cardiovascular disease risk. These outcomes aren’t immediate, but they reinforce the role of fibre as a long-term investment in health. High Fibre Diet Foods We’ve written about his previously (see here for our guide on high fibre foods) but in short, building a high fibre lifestyle doesn’t require a complete overhaul of your current diet. It’s instead about increasing variety and making more intentional choices within your existing routine. Below we have outlined some key foods that can help increase fibre intake. Whole grains Oats, brown rice, quinoa, and wholegrain bread provide a steady source of fibre while supporting sustained energy. They’re an easy upgrade from refined grains and tend to be more filling. Fruits and vegetables Eating more fruit and vegetable is one of the simplest ways to raise fibre intake. A useful approach is to focus on variety: Berries and apples for convenience Leafy greens for micronutrient density Root vegetables for more substantial meals Legumes Lentils, chickpeas, and beans are among the most fibre-dense foods available. They also provide plant-based protein, making them particularly useful in meals focused on satiety and recovery. Nuts and Seeds Chia seeds, flaxseeds, and almonds offer a concentrated source of fibre and can be added easily to meals. Even small additions, such as a tablespoon of seeds in a breakfast or smoothie, can make a difference over time. A Smarter Way to Think About Fibre Fibre doesn’t need to be treated as a standalone goal. It works best as part of a balanced, well-structured approach to nutrition - one that supports how you feel day to day, not just how you perform in the odd moment. For most people, that starts with whole foods. Building meals around plant variety, whole grains, and consistent habits. From there, the role of supplementation becomes more effective. The Innermost approach reflects that balance. Products like The Greens Blend can help support daily plant intake and micronutrients, while products such as The Lean Protein fit alongside a diet that prioritises both protein and fibre, rather than one at the expense of the other. Building a high fibre diet isn’t about adding or overhauling, instead It’s about making those small adjustments that bring more consistency to your routine. Over time, those shifts tend to have the biggest impact - not just on digestion, but on how your body feels, performs, and recovers. References Renolds, A., Mann, J., Cummings, J., Winter, N., MDiet, E., Morenga, L. (2019). Carbohydrate quality and human health: a series of systematic reviews and meta-analyses. The Lancet. 393 (10170), 434-445. Click here.  NHS UK. How to get more fibre into your diet. Click here.  Hullings, A., Sinha, R., Liao, L., Freedman, N., Graubard, B., Loftfield, E. (2020). Whole grain and dietary fiber intake and risk of colorectal cancer in the NIH-AARP Diet and Health Study cohort. The American Journal of Clinical Nutrition. 112 (3), 603-612. Click here. Threapleton, D., Greenwood, D., Evans, C., Cleghorn, C., Nykjaer, C., Woodhead, C., Cade, J., Gale, C., Burley, V. (2013). Dietary fibre intake and risk of cardiovascular disease: systematic review and meta-analysis. BMJ.347. Click here. Read more