icon-account icon-glass

Popular Products

The Lean Protein
Whey protein powder for weight-loss.
The Energy Booster
Pre/intra-workout powder with BCAAs.

Growth And Goals With Innermost Insider Amy Costello

27th October 2021

27th October 2021

By Caitlin Bell

Hi Amy! Can you tell us a bit about how you got into your fitness journey?

Hey my Innermost faves! I was always involved in sports at school and loved running, but it was on my travels to Sydney, Australia, that my passion for fitness as a real, positive, daily part of my life, kicked off.
I love the lifestyle in Sydney. Everyone is really invested in their health and fitness and that fuelled me to get my Personal Training qualification and start going to the gym (I’d never stepped foot in a gym before this!), where I learnt absolutely everything I could about functional and resistance training. I read books, I watched technique videos, and I put all of it into practice in my own training and programming. But this was just the beginning!

How did your passion for fitness begin to translate into your full-time job?

Whilst living in Australia, I met Mike, who is now my fiancé (woo) and my business partner in the fitness empire we are building! 
It actually started when my Aussie visa was due to expire, and we were game-planning ways that we could stay together and avoid doing the long-distance relationship thing. At the time I was coaching at an F45 studio in Sydney, and after a bit of research, we realised there was only one F45 studio in London - so Mike got thinking - why don’t we see if we can open one! 
It then all happened very fast - within a couple of months we had signed with F45 to open our own studio, had packed our bags and were moving to London. 4.5 years later and we've built an incredible member base and community at F45 Tottenham Court Road, and also launched our own fitness retreat company, Salt Escapes, where we run fitness holidays at various beautiful destinations around the world! 

What was more challenging, opening your F45 Studio or launching Salt Escapes? 

I would have to say F45. It was our first business so there was a lot to learn and a lot to prove. We made a heap of mistakes and knew next to nothing about business, but we worked our little asses off to build our gym into what it is today. 
When we launched Salt Escapes, we already had an engaged, interested customer base in our clients at the gym, so it wasn’t SO terrifying to launch! Also, with it being our own brand and company, there were no limitations like with F45. Instead we were free to branch out, be adventurous and see what works. This is how we like to do things!

How has your business evolved through lockdown? 

Wow, it’s been a testing year. We lost a lot of members throughout the past year. Being located in central London was a huge advantage for the first few years of business, but when lockdown hit, everyone just disappeared! 
It’s almost as though we’ve had the chance to start from scratch, which has meant we’ve had the opportunity to re-evaluate everything from our finances, processes and sales strategies, to our membership offering and client-relationships. 
From that perspective (and ONLY that perspective), it’s been great for us. We’ve been given the opportunity to build our business back stronger. Nine months of closure allows you to do a lot of reflecting. 

How have you personally evolved throughout the last year? 

Well I’ve managed to avoid packing it all in and moving to a tiny island in the middle of nowhere - does that count?! 
Haha, no but seriously - I guess for me, it’s been the year I’ve actually understood what it means to look after your mental health. It’s been a really challenging year to own a gym and a travel business, and my sleep and mental health has taken a battering. 
Realising the importance of “self-care” (sounds cheesy, but it’s a whole vibe) has been a game-changer. For me, it’s walks in the park, my daily 10 minute Calm, switching my phone to Do Not Disturb, and prioritising learning (books, podcasts, journals). 

What does the word ‘growth’ mean to you?

Aside from #gains? Ha. 
In the past couple of years - Mike and I have started saying to each other, and our team, “we like solutions, not problems”. Look, in work, training, life, there are always going to be problems, difficult people, and tough days. I used to obsess over the problems to the point they’d keep me awake at night. Now the minute a problem arises, I start thinking about the solution. Because there’s always a solution if you look hard enough, so what’s the point in stressing over things you have the power to do something about? 
For me - that’s growth. Pushing forward, maintaining a solution-driven outlook whatever is thrown at you, and working out how to move past problems - adapt, reflect, learn. 

How do you push past plateaus?

I think the most important thing is that you recognise you’ve hit a plateau. Whatever it is you’re trying to change, be it weight loss, muscle gain, fitness levels, or whether it applies to work and productivity. I love to track everything. I write down all of my workouts, including the reps I’ve done, the weights I’m lifting, and even notes about how I felt during and after the session. This helps me clearly see when I’ve plateaued in my training, and encourages me to then reassess my goals and make a plan to push forward. 
There are so many ways to mix things up. If it’s a training plateau, maybe try hitting the gym with a friend, trying out a different class, or getting a PT for a few sessions to give you some fresh ideas and perspective. 

What aspect of your life do you struggle to develop most? 

For me, it’s definitely finding balance. Running two businesses doesn’t usually allow for much down time, especially as I work with my fiancé, which means that we’re always either at work or talking about work. I really love working for myself, but it’s definitely had a big effect on my social life. Any 'time off' I do get, I usually feel like I just want to chill out alone. I definitely find it a struggle to maintain or build more meaningful friendships these days. Don’t get me wrong - I have a whole heap of wonderful people in my life - I’m just not that hot on messaging back or letting my hair down and going for a night out these days. 

Do you set yourself goals? How do you make sure you achieve them?

All the time! But I read a great book recently, Atomic Habits by James Clear, which taught me about the importance of goals that are specific and actionable. He says goals are good for setting direction, but systems are best for making progress. I can resonate with this from my own experiences, and from watching so many clients set themselves goals, and then feel like they’ve ‘failed' because they’ve been so focused on the end goal, as opposed to making small, actionable, daily changes to get them there. 
So for example, a small goal of mine at the moment is to drink more water as I’m generally pretty bad at this. I’m making this a habit by setting out my bottle of water before I go to bed each night, so I see it first thing in the morning. I tell myself I can’t leave the house for work until I’ve had 600ml water. I also use a water tracker app, which sends me little push notifications throughout the day. System in place, and so far it’s working and I feel great! 

What is your greatest life accomplishment?

It’s got to be building Salt Escapes. Mike and I have been on the same page since we met. We wanted to create a life where we could work for ourselves and travel the world. We’ve achieved that with Salt Escapes, and there’s a lot more to come! 
On top of that, I don’t think there’s any greater feeling than being in a beautiful part of the world, with a bunch of amazing people who have just had the week of their lives, and have been inspired beyond measure, and realising that you made that happen. 

What’s one goal you’re going for now?

Work goal: Building my businesses back up in a post-pandemic world. We’ve got 9 Salt Escapes trips on the schedule for this year and I’m going to do everything in my power to make them all happen. I just need Boris to play ball! 
Personal goal: Mike and I want to buy our first house by the beach. It’s definitely a longer term goal, but everything in our foreseeable future is now driven by this end goal. We’re focused on a future of beach walks, BBQs and puppies! 

What are the benefits of having a growth mindset?

The opportunities! Personally, I didn’t do too well at school. I didn’t get the point of learning for the sake of learning. But I’m pretty proud of the fact that through hard work, applied knowledge and a lot of determination as an adult. I now own two businesses, work for myself and get to travel the world. 
Natural talent or academic intelligence is one thing, but a growth mindset allows you to experience success, build resilience and overcome challenges, all through a simple shift in your perspective. 
To keep up with Amy, follow her on Instagram and on Salt Escapes

Need Expert Advice?

Other Insights

Creatine for women
The word ‘creatine’ might conjure up images of gym bros, but don’t fall into the trap of thinking it’s just for men. Creatine is one of the most widely researched supplements in the nutrition game, and one which can offer a host of benefits to many people.  Let’s dig into the topic of creatine for women – how it works, proven benefits, how it differs for women vs men, and how to start working it into your routine. What is creatine? To put it simply, creatine is a mineral our bodies naturally produce which helps to create Adenosine Triphosphate (ATP) – a very important energy-carrying molecule.  It has been extensively researched for its ability to help increase performance in high intensity exercise1, potentially leading to greater training results.  You can find out more in our complete guide to creatine.  Creatine for women: why interest is growing There are a lot of misconceptions around creatine – maybe you’ve heard it’s for ‘bulking’ or that it causes undesirable water retention. Either way, there have definitely been some ideas floating around which could understandably have put people off working it into their nutrition regime.  In reality, creatine can support performance, strength and recovery without changing your body composition in the way some might assume. It can be a great tool for not only strength training but also HIIT and functional fitness, as well as overall health and even ageing!1  With all this in mind and more research coming out all the time, it’s no surprise that interest is growing amongst women when it comes to making use of creatine.  Creatine for women vs men: is there a difference? Creatine works in the same biological way for both men and women, but there are some differences in terms of the results or impacts you may see.  In general, women tend to have significantly lower baseline creatine stores than men2, meaning creatine supplementation can be potentially even more beneficial for them. That being said, nutritional requirements and impacts can vary hugely based on each person’s individual hormone concentration, especially during different phases of the menstrual cycle3 – so results can differ. The benefits of creatine for women  Improved strength and performance Creatine helps regenerate and produce ATP4, which allows for better performance in short bursts of intense activity. As such, it can be a very valuable tool for supporting progressive overload in strength training, allowing you to lift heavier and see greater results from your workouts. Support for lean muscle and body composition Combing creatine supplementation with resistance training is a widely recognised method for increasing lean muscle mass5, which can make a significant difference to your overall body composition. One of the common misconceptions of creatine we spoke about earlier is water retention and subsequent weight gain. Whilst the water retention point isn’t untrue, the water is stored inside the muscle cells rather than under the skin6, which actually makes your muscles appear larger and more defined.  You could typically see an initial weight ‘gain’ when starting with creatine due to this, but this usually stabilises after a few weeks.  Cognitive and mental benefits Aside from the huge physical benefits, creatine can actually offer a helping hand when it comes to cognition and mood, too.  Some research has shown creatine has indicated positive effects by restoring brain energy levels, and it may even be more effective for females2. Other studies have even found evidence that creatine use can improve short term memory, reasoning and intelligence7.  Hormonal and life stage support The evidence is still emerging on this topic, but there are a host of potential creatine benefits for women when it comes to hormonal and life stage support. For example, it is suggested that post-menopausal females can see benefits in terms of skeletal muscle size and function when supplementing creatine, as well as favourable effects on bones themselves.  With hormone-related changes influencing the way creatine is produced in the body, supplementation can be particularly important during your period, as well as during and after pregnancy or menopause2.  Side effects of creatine for women When adding any new supplement into your regime, considering any possible side effects is a common part of the process. Thankfully, creatine side effects for women are very minimal!  We’ve discussed water retention already, but this can sometimes lead to a 1-2kg initial weight gain which will usually stabilise in a few weeks – and your extra-hydrated muscles can actually perform even better as a result.  The other commonly discussed side effect is gastrointestinal distress (stomach cramps, nausea etc). This is typically only an issue if you’re taking very high doses of more than 10g at any one time, so stick to the product’s recommended servings and you should be in the clear.  Overall, creatine is a safe supplement to take when used within regular dosing guidelines1.  How to start using creatine As with any new supplement you’re interested in taking advantage of, the best way to start is by making it as simple as possible to fit into your regular routine.  A typical daily dose of creatine sits between 3-5g, so look for a product which can give you that in an easy-to-use form. For example, Innermost’s The Power Booster contains 60x 5g servings – the perfect amount for a full eight week cycle if consuming daily. Just mix a serving with water or juice, or even throw it into a protein shake and you’re all set for the day. That’s not the only way to have creatine, though. Innermost’s The Strong Protein is a super powerful protein blend with 34g protein and 3g of creatine in every serving – giving you everything you need for a properly fuelled, powerful workout.   So, it’s a very effective supplement and it’s very easy to take. What’s not to love? Creatine for women – easy and effective Creatine is well-researched, easy to use and it can be super effective. If you’re interested in improving your performance, recovery and strength, it’s almost a no-brainer. Make it a part of your daily wellness routine, stay consistent with it and see the results - we think you’ll like them.  References Kreider RB, Kalman DS, Antonio J, Ziegenfuss TN, Wildman R, Collins R, Candow DG, Kleiner SM, Almada AL, Lopez HL. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. 2017 Jun 13;14:18. doi: 10.1186/s12970-017-0173-z. PMID: 28615996; PMCID: PMC5469049. Click here.   Smith-Ryan AE, Cabre HE, Eckerson JM, Candow DG. Creatine Supplementation in Women's Health: A Lifespan Perspective. Nutrients. 2021 Mar 8;13(3):877. doi: 10.3390/nu13030877. PMID: 33800439; PMCID: PMC7998865. Click here.  Wohlgemuth KJ, Arieta LR, Brewer GJ, Hoselton AL, Gould LM, Smith-Ryan AE. Sex differences and considerations for female specific nutritional strategies: a narrative review. J Int Soc Sports Nutr. 2021 Apr 1;18(1):27. doi: 10.1186/s12970-021-00422-8. PMID: 33794937; PMCID: PMC8015182. Click here.  Saito S, Cao DY, Okuno A, Li X, Peng Z, Kelel M, Tsuji NM. Creatine supplementation enhances immunological function of neutrophils by increasing cellular adenosine triphosphate. Biosci Microbiota Food Health. 2022;41(4):185-194. doi: 10.12938/bmfh.2022-018. Epub 2022 Jun 17. PMID: 36258765; PMCID: PMC9533032. Click here.  Mohammad Ali Izadi, Farhad Daryanoosh, The effect of creatine supplementation on muscle protein synthesis in athletes: A review. Nutrition Clinique et Métabolisme,Volume 39, Issue 4, 2025, Pages 273-281, ISSN 0985-0562. Click here.  Powers ME, Arnold BL, Weltman AL, Perrin DH, Mistry D, Kahler DM, Kraemer W, Volek J. Creatine Supplementation Increases Total Body Water Without Altering Fluid Distribution. J Athl Train. 2003 Mar;38(1):44-50. PMID: 12937471; PMCID: PMC155510. Click here.  Avgerinos KI, Spyrou N, Bougioukas KI, Kapogiannis D. Effects of creatine supplementation on cognitive function of healthy individuals: A systematic review of randomized controlled trials. Exp Gerontol. 2018 Jul 15;108:166-173. doi: 10.1016/j.exger.2018.04.013. Epub 2018 Apr 25. PMID: 29704637; PMCID: PMC6093191. Click here. Read more
I've Been Taking Creatine Every Day For Six Years
Something happens in March. The people who started strong in January, the ones with the new routine, the new kit, the renewed sense of purpose, are now splitting into two groups. The ones who've lost momentum. And the ones asking sharper questions. Not "what should I take?" but "what actually works?" Creatine keeps coming up. And every time it does, I notice the same pattern: people either swear by it without really understanding why, or they assume it's something bodybuilders use and leave it alone.I've been taking it every single day for six years. So let me tell you what I actually know. Why I started I didn't start taking creatine for the reasons most people assume. I wasn't trying to get bigger. I was training consistently, eating well, and hitting a wall. That frustrating place where effort stops translating into progress. A friend with a sports science background told me creatine was the most researched supplement in existence. More peer-reviewed studies than almost anything else on the market. That got my attention. So I started. And I kept going. What I noticed The first week, nothing dramatic. But over the following three to four weeks, something shifted. I could push a little harder. An extra rep. Slightly more on the bar. Training sessions that didn't end in the usual flat feeling of having nothing left. Those are marginal gains. They don't feel significant in the moment. But they compound. Over months, they're the difference between a plateau and real, measurable progression. The one time I stopped, about two years in, during a stretch of heavy travel where I got lazy about it, I felt the absence more than I expected. Not immediately. But within a few weeks, training felt duller. Less sharp. I put it back in and haven't looked back since. I also noticed something I hadn't anticipated: my thinking felt clearer on the days I trained hard. I assumed it was the exercise. I later learned creatine may have had something to do with that too. What creatine actually does Most people think of creatine as a muscle supplement. That's not quite right. What creatine does is help your body regenerate ATP, adenosine triphosphate, more efficiently. ATP is your cells' primary energy currency. It's what your muscles burn during intense effort. But it's also what your brain runs on. Here's the mechanism: during high-intensity exercise, your body depletes ATP rapidly. Creatine stored in muscle tissue, in the form of phosphocreatine, allows you to replenish that ATP faster. That's why creatine consistently improves performance in short, explosive efforts: weightlifting, sprinting, high-intensity intervals. But the same ATP recycling process happens in the brain. A growing body of research suggests creatine may support cognitive performance, particularly under conditions of stress or sleep deprivation. A 2021 study published in Scientific Reports found meaningful improvements in memory and cognitive function following supplementation. It's not a nootropic in the trending sense of the word. But the evidence is real, and it applies to more people than the gym crowd. The effective dose is well established: 3 to 5 grams per day, taken consistently. No loading phase required. No cycling. Just daily consistency, and that's where most people go wrong. What the industry does instead Creatine monohydrate has been around for decades. That's a problem for brands that need something new to sell. So new formats appear. Creatine HCL. Buffered creatine. Kre-Alkalyn. Creatine ethyl ester. Creatine gummies. Each one marketed as superior: faster absorbing, more bioavailable, easier on the stomach. The evidence doesn't support it. Multiple head-to-head comparisons, including a widely cited review in the Journal of the International Society of Sports Nutrition, found no meaningful performance advantage for alternative creatine forms over monohydrate. In some cases, the alternatives perform worse per gram of active compound. In the case of creatine gummies, several brands including some very large ones have been shown not to contain the creatine concentrations they claim on the label. What you actually want is simple: a clinically relevant dose of creatine monohydrate, taken every day. That's it. What I use The Power Booster is 100% pure creatine monohydrate, nothing added, nothing unnecessary. Five grams per serving, which sits right at the evidence-supported daily dose. It's not complicated because it doesn't need to be. The science on creatine monohydrate is already settled. The job is just to take it consistently. (If you have a friend still on the fence about creatine, forward this their way. It's one of those rare supplements where the evidence is clear enough to just recommend without caveats.) Read more