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From Couch to 21.1k: How to Train For A Half Marathon As a Beginner

12th February 2025

12th February 2025

By Beth Shelper

It’s almost that time of the year again. With the long cold nights of January finally over and Autumn/spring on the horizon, we’re slowly approaching what we like to call ‘half marathon season’. A time that starts with signing up for an event and wondering how to put a training plan into place and ends with the sense of accomplishment and runner-high that is so unique to the sport.

But this is assuming you’ve gone through this dance before. The question is how do you approach this distance if you’re new to running? Is it something that is even achievable in 15 weeks?

While the short answer is of course! The longer answer? Read on!

Below we’ve included our complete guide to the half marathon for those who are completely new to the distance, and event, or even to running itself. What’s more, our training plan details just how you can build up your fitness levels as a beginner from zero to race day ready.

Why the half marathon?

Before committing to running a half marathon, it’s important to ask and understand why you would want to run the 21.1k instead of a shorter 5k -10k or even a 42.2k marathon distance.

While either of these options is definitely doable – whatever your ability – the half marathon provides the perfect middle ground in terms of distance. Something that is achievable within a reasonable timeframe and will provide a genuine challenge, but without needing days or weeks to recover.

To seal the deal even further, a half marathon also has the benefits of:

Improved health

An effective half marathon training plan will see you do more than just run. It also includes strength training, endurance, flexibility and balance, keeping your whole body at tip top fitness and improving things like cardiovascular and general health

Confidence boosting:

As a runner myself, I can attest. There isn’t a feeling much better than setting a goal, going through the half marathon running plan and coming out at the end having smashed your distance target. It taught me that I can do almost anything if I put my mind to it.

Social community:

Whether you’re deep into training or at the event itself, the half marathon has such a vibrant community of like-minded individuals who you can share the experience with. 

Half marathon training exercises

To make your training a little easier, we’ve have outlined a list of workouts to complete as part of your training plan and their benefits on the body.

Running endurance exercises

No surprises, but your training should consist of plenty of running workouts of different intensities and approaches.

Intuitive running workouts

Intuitive Runs are all about listening to your body. There is no distance target, no pace goal and no pressure.

It’s all about running at a conversational and comfortable pace (don’t fret if you have to start walking), offering a chill experience to build a positive relationship with running. This one is particularly good to experience with a friend or community of runners.

Beginner runs

As the name suggests, these beginner runs are where most training plans should start – especially for those who have never really been into running. These slower, conversational-paced runs are all about building up your aerobic capacity; initially starting at the slowest speed and with each run getting slightly faster.

Interval running

Interval (or intermittent) running exercises are just that – runs where you switch between high- and low-intensity pace at regular intervals.

While more challenging than the beginner run, interval training has the benefit of increasing your body’s lactate threshold as well as improving running efficiency. In layman’s terms you’re training your body to use less energy at the same pace, allowing you to more comfortably sustain a pace during a half marathon run.

Long distance runs

Long-distance runs are the cornerstone to any half-marathon training plan. They help build your body’s endurance and are generally fantastic at building a runner's confidence for event day. It is however fundamental to get them right to avoid injury and burnout.

Consistency: Improvement and injury avoidance is all about getting the right number of endurance runs in from day 1 to run day. Try and aim for 1 long-distance workout per week for the perfect balance.

Building tolerance: If you’re just starting out on your running journey, you need to start slow and short and gradually build up pace and distance. Generally, your running plan should follow a “10% rule” where between runs, the distance is increased by no more than 10%. 

Gear and nutrition: Nutrition - as well as what you wear – plays a major role in how your body performs on race day. Long runs are a great time to experiment with different protein shakes and gels that work for you – avoiding any surprises or other worries on the big day.

RecoveryStretching before and after, getting the right amount of sleep and eating the right foods are key to improving the recovery process. Again, try and get into a routine long before race day to avoid any unexpected impacts.

Focused runs

Focused runs allow you to tailor pace and distance to whatever it is you need to improve on. For instance, preparing for the hills of a half marathon? You might choose targeted incline runs one session and interval runs the next.

Strength exercises

Strength workouts should also play a part in your half-marathon training plan as unlike running workouts alone, trained muscles, improve running form, power, and stability, helping to reduce your chances of injury during the run.

Don’t worry, we’ve included a few workouts that can be tailored to your ability - making them perfect for everyone from beginner to specialist.

Lower body strength workouts

Squats: To make the most of your squats, stand feet shoulder-width apart and lower your hips as if you're sitting in a chair. Keep your back straight, chest up, and knees tracking over your toes

Lunges: Step forward with your right leg and lower your hips until both knees are bent at 90 degrees. Push back up to the starting position and repeat with your left leg.

Glute bridges: Lie on your back with your knees bent and feet flat on the floor. Lift your hips off the ground, squeezing your glutes at the top

Core strength workout

Planks: Start on your hands and knees, then lower onto your forearms. Keep your body in a straight line from head to heels. Hold for 30 seconds, gradually increasing the hold time as you get stronger.

Dead bugs: Lie on your back with arms extended towards the ceiling and knees bent at 90 degrees. Lower your right arm and left leg simultaneously towards the floor, keeping your lower back pressed against the ground. Return to the starting position and repeat with your left arm and right leg

Bicycle crunches: Lie on your back with hands behind your head and knees bent. Bring the opposite elbow to the knee while extending the other leg.

Upper body strength

Push-ups: Start in a plank position and lower your chest towards the ground by bending your elbows. Push back up to the starting position

Rows: Pull a resistance band or dumbbells towards your chest, engaging your back muscles.

Overhead press: Press dumbbells overhead, strengthening your shoulders.

How long does it take to train for a half marathon?

This is another question that beginners and professionals alike wonder to themselves. How much time should I give myself on my training plan to be 21k ready? While this can depend largely on the individual, for a beginner we would suggest giving yourself no less than 16 weeks training to allow for a gradual build up in fitness and reduce your chance of injury.

What is a respectable half marathon time?

It’s one of the most frequently asked half-marathon questions we get asked. “What is a good half marathon time?” Often quickly followed by “and what sort of training plan do I need to hit this target”. The answer is always the same – a good run time is entirely based on what you can achieve.

Sure we can point out arbitrary time averages, but things like age, gender, experience, training background, injury history, and personal goals all play a significant role. If this is your first time taking part in the run then your main goal should be to cross the line, anything else you decide to aim for should be something you are realistically able to achieve.

Time to get half marathon ready!

So there you have it!

You might not think it, but a half marathon is completely achievable in a smaller amount of time than you probably think, so why not consider signing up to your first today?

For added energy, muscle growth and repair, why not consider one of our science backed protein powders such as The Fit Protein?

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It’s that time of the year again - the New Year's fitness buzz. A time where motivation is high, new workout plans are made, gym bags make a return, and everything feels full of possibility! And yet, for many people, this momentum is short-lived. By mid-February, routines can start to slip. Sessions get skipped. Motivation fades. The resolution quietly dissolves, something often accompanied by frustration or guilt. If that sounds at all familiar, it’s firstly worth saying this upfront: it’s not a personal failure. In most cases, it’s a structural one. It might sound strange, but having a long term and consistent fitness routine isn’t solely about having the most ‘willpower’, or forcing yourself to run just because it’s ‘new year, new me’, it’s about building an individual routine that works for you and sets you up in the best position to hit your workout goals in the long term. To make things easier, we’ve put together this nifty guide diving into the science of new year’s fitness, why traditional workout resolutions so often fall apart, and what genuinely helps when it comes to building habits that last for the long term. Right, let’s get into it. Why New Year’s fitness resolutions don’t succeed  Before exploring how you can set your fitness goals for the long term, it’s important to understand why so many fall short.  The main reason comes down to something psychologists call the “fresh start effect”. This is a period that interrupts the calendar schedule (such as New Year's), creating a mental separation between the past and the future. Such a fresh start makes change - like the restarting of a fitness routine - mentally easier to overcome because the past feels neatly boxed away.  While this sounds good on paper, the problem is that motivation alone isn’t enough to sustain long-term behavioural change.  Many New Year’s fitness routines struggle to last because they often: Focus on outcomes instead of training plans and sustainable behaviours. Target instant change Focus on unrealistic fitness goals Shall we run from the top? Outcome-based targets One pitfall people often find themselves in is setting a New Year’s fitness goal that is driven by outcome without proper planning.  Some examples might be: Losing weight  Getting fit  Running a marathon All great targets to strive for, yet without a training plan or strategy to achieve them, they can quickly feel unattainable and therefore interest drops off. This makes creating and sticking to a new year’s exercise plan key to achieving your goals, asking: what do you want to achieve? What steps are you going to take to achieve them? And how will you measure your progress? Too much change and unattainable fitness goals With the fresh start effect, it can feel productive to try and overhaul all your health practices. A new training plan. A stricter diet. Earlier mornings. Fewer social plans. Better sleep. More productivity. Individually, these changes are all positive (we’ve spoken about the positive effects of many in the past ourselves). Making all these large life changes in a short space of time, however, can lead to something called ‘cognitive overload’. Each new habit requires attention, decision-making, and self-control, leading to decision fatigue buildup and increasing the likelihood that behaviours will be dropped rather than maintained. Sustainable change tends to work the opposite way. Small, manageable shifts layered gradually over time allow habits to stabilise before new ones are added. Instead of replacing your entire lifestyle in January, long-term routines are built by choosing one or two priorities, letting them settle, and then building from there. Unrealistic fitness goals Another common reason why new year workout plans don’t work is that the end goals being set aren’t realistic to achieve in the time frame given. Training every day. Completely overhauling diet. Expecting visible results within weeks are just a few sure-fire ways to see your fitness plans gone by the end of January. This is because when progress isn’t immediately visible, individual motivation drops. Any missed sessions start to feel like failure, and the routine becomes something to avoid rather than return to. This can lead to a plateau in motivation and a workout rut that sees you lose all motivation to continue your fitness plan. The best way to avoid this? Tailor your New Year’s workout plan to what is realistic for you to achieve. Remember, everyone is different and you should avoid trying to replicate someone’s workout plan who is at a much different point in their journey. What helps you stick to a fitness routine So now we’ve covered the pitfalls faced with New Year's resolutions, what are some of the ways that you can set yourself up for success going into 2026? Starting your workouts small It might sound a little backward, but maintaining a new year’s fitness routine is all about incremental improvements - starting small and building up to ambitious fitness goals. In essence, try to make your workouts feel manageable from the outset.  This removes much of the physical and mental friction caused by sharp changes and removes the possibility of overtraining syndrome - something that can lead to both physical and mental fatigue. Instead of asking your body and mind to adapt to a dramatic shift all at once, you allow both to adjust gradually - which is exactly how sustainable habits are formed. Personal, not performative goals A common reason New Year's fitness routines fall apart is that the goal itself was never truly personal.  Many resolutions are shaped - often unconsciously - by external pressures: how we think we should look, what others are doing, or what feels ‘socially impressive’. These goals can create a strong initial push, but they rarely provide enough depth to sustain effort in the long term. Personal goals, by contrast, are rooted in lived experience. They’re connected to how you want to feel day-to-day, not how you want to appear to others. Wanting more stable energy through the afternoon, fewer aches and pains, better sleep, or improved resilience during stressful periods may not sound as dramatic as a body transformation, but they’re far more motivating over time.  This is supported by behavioural research showing that exercise routines rooted in intrinsic motivation - feeling better, moving more easily, managing stress - are significantly more likely to be maintained long-term than goals shaped by appearance or external pressure. These outcomes are felt quickly and repeatedly, which reinforces the habit itself. Fitting fitness into your routine Again, seems counterintuitive, but a workout routine that only works under perfect conditions won’t survive beyond January.  You can’t change things like long workdays, family responsibilities, travel, and low-energy weeks, and you shouldn’t try to. Your regular workout routine should function around these things. The key here is that fitness is flexible. It allows for shorter sessions, longer sessions, varied training styles, and a broader definition of movement that can all be tailored to your day-to-day routine. Your also not limited by location, you could workout at home, at the gym, with groups, whatever fits into your routine.  The role of recovery in New Year’s fitness One of the most overlooked reasons people struggle to stick to New Year’s fitness routines is actually physical and mental fatigue. While this is to be expected to some extent - and you can control fatigue by following the above tips - you also need to consider the importance of effective recovery and how you are fuelling your body between workouts. Just some of the ways you can improve recovery are: Sleep quality: Quality sleep is when the body actually recovers, repairs tissue, and resets energy levels for the next day. Without it, even light training can start to feel disproportionately demanding. Effective hydration: Staying properly hydrated helps support circulation, muscle function, and focus, making both workouts and recovery feel smoother and more manageable. Complete nutrition: Providing the body with enough protein, carbohydrates, fats, and micronutrients gives it the building blocks it needs to repair, adapt, and maintain steady energy over time. It’s also worth considering tailored nutrition-focused supplementation such as Innermost’s The Recover Capsules and The Hydrate Blend. Reframing New Year fitness: from resolution to routine An effective mindset shift you can make this new year is moving away from the idea of a “resolution” and towards a routine. Resolutions are often outcome-focused - lose weight, build muscle, run faster. Routines are behaviour-focused - train three times a week, walk daily, prioritise recovery. This reframing is also key when thinking about how to stick to your New Year’s fitness resolution. Instead of asking, “Am I seeing results yet?”, the more useful question becomes, “Can I repeat this next week?” Remember, the most effective fitness routines aren’t created in January - they’re carried through February, March, and beyond. References Dai, H., Milkman K.L., Riis,J. (2013).The Fresh Start Effect: Temporal Landmarks Motivate Aspirational Behavior. Management Science. 60 (10), 2563-2582. Click here. Cezar, B., Macada, A. (2023). Cognitive Overload, Anxiety, Cognitive Fatigue, Avoidance Behavior and Data Literacy in Big Data environments. Information Processing & Management. 60 (6). Click here. Ntoumanis, N., Healy, L. et.al. (2014). Self-Regulatory Responses to Unattainable Goals: The Role of Goal Motives. 13 (5), 594-612. Click here. Cleveland Clinic. Overtraining Syndrome. Click here. Sebire,S., Standage, M., Vansteenkiste,M. (2011). Predicting objectively assessed physical activity from the content and regulation of exercise goals: evidence for a mediational model. 33 (2), 175-197. Click here.   Read more
Why the Festive Period Breaks Your Habits
Every year, the festive period gets blamed for breaking people’s health. Too many meals out. Too many late nights. Too many “I’ll start again in January” moments. By the time the New Year arrives, the narrative is already locked in. Damage done. Time to reset, detox, or punish yourself back into shape. But here’s the truth. The festive period doesn’t ruin your health. Losing structure does. The end of the year is uniquely disruptive. Work schedules loosen. Social plans multiply. Travel, celebrations, and irregular routines blur the days together. Sleep shifts later. Meal timing becomes unpredictable. Hydration drops. Movement becomes sporadic. Stress quietly rises. Food gets the blame because it’s visible. But the real changes are happening beneath the surface. Our bodies are built around rhythm. Circadian biology governs hormones, appetite, energy, glucose regulation, and recovery. When sleep timing drifts and meals become inconsistent, insulin sensitivity drops, hunger cues become noisier, and cravings increase. Not because you’ve lost discipline, but because your physiology is responding exactly as it should. This is why willpower fails so reliably during the festive period. Willpower is not a plan. It never was. Behaviour follows environment. And the end-of-year environment is designed to disrupt even the best intentions. More social pressure. More choice. Less routine. Less recovery. Expecting motivation to override that is unrealistic. Yet the wellness industry loves this moment. January resets. Detoxes. Thirty-day transformations. The implication is always the same. You slipped up. Now fix it. That framing is wrong. You didn’t fail. Your anchors disappeared. So instead of trying to be perfect between now and the New Year, there’s a better approach. Protect structure. Not outcomes. I think of this as a Minimum Effective Routine. The smallest set of habits that keep your system regulated when life gets noisy. You don’t need control all day. You need a few non-negotiables. First, a morning anchor. How you start the day sets the tone for everything that follows. Consistent wake times, early light exposure, and hydration matter more than whether you train or not. Even during the festive period, waking within a similar window each day helps stabilise energy, appetite, and sleep later on. Second, a nutrition anchor. Health doesn’t unravel because of one rich meal. It unravels when eating becomes random. Skipped meals followed by late, heavy dinners create blood sugar swings that drive overeating. One simple rule makes a difference. Anchor at least one meal per day around protein and fibre. No tracking. No guilt. Just consistency. Protein in particular becomes critical when routines loosen. It supports lean mass, regulates appetite hormones like GLP-1, and reduces the likelihood of grazing later in the day. Third, a movement anchor. This is not about training hard. It’s about staying active. Walking, light resistance work, mobility, or a short session at home. Ten to twenty minutes counts. Movement improves glucose handling, digestion, mood, and sleep quality. It is one of the most reliable ways to offset stress and irregular eating. Fourth, an evening wind-down anchor. Late nights are part of the festive period. That’s normal. What matters is how often they stack. Alcohol, screens, and social stimulation all fragment sleep. A simple wind-down routine most nights helps signal safety to your nervous system. Lower lights. Fewer screens. Breathing. Reading. Repetition matters more than perfection. These anchors don’t make you “healthy”. They keep you regulated. Now, an honest word on supplements. Supplements won’t rescue a chaotic routine. Anyone promising that is selling shortcuts. But they can support physiology when structure is under pressure. Hydration often drops at this time of year, especially when alcohol intake increases. Electrolytes support fluid balance, nerve signalling, and muscle function. Protein becomes more important when meals are irregular, helping to stabilise appetite and maintain muscle. Micronutrients also matter when sleep, stress, and food quality are inconsistent. This is how we think about Innermost products. Not as a reset. Not as a fix. But as tools that support the fundamentals when life is busy and routines loosen. The biggest mistake people make is treating the festive period as a write-off and the New Year as a clean slate. That approach creates a cycle of extremes. If you protect structure now, the New Year doesn’t need repairing. There’s no detox required. No dramatic restart. Just continuity. Finally, as we close out the year, I want to say thank you. Thank you for your support. Thank you for trusting us in an industry that often values hype over health. And thank you for being part of a community that cares about doing things properly. I hope you enjoy the festive period with your friends and loved ones, get some well-earned rest, and step into 2026 feeling steady, not behind. Read more