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Professional. Effective. Fitness.

At NK Fitness our goal is simple:  To ensure that you, along with all of our clients, receive the highest quality training advice and support and that we deliver it to you exactly when and how you need it.  This means giving you cutting edge, bespoke and fad-free personal training / strength & conditioning solutions based upon our perfect blend of experience, proven training techniques and the latest research from the fields of health, fitness and performance.

At NK Fitness it really is all about you!  Our small team of expert personal trainers and coaches are passionate about delivering a results driven service and outstanding value for money in a highly friendly and personable way.  All hailing from the West Country originally we value honesty, integrity and reliability in everything that we do and provide mobile personal training services throughout Berkshire, Surrey, Central and South West London.

Founded by leading high performance fitness coach Nathan Kelly we are proud of our proven track record having successfully worked with Olympians, professional teams, professional athletes, celebrities, prominent London professionals and many many more.  However, we are even more proud of our outstanding client retention and very loyal clientele - please check out our testimonials and case studies for more information on our previous and current work.

Whether you’re looking for personal training to transform your body or restore it to a former glory, or you’re an athlete needing to find the extra 5% in your competitive performance then please feel free to browse our training pages where you will find all of the information you need about the services we offer to get the best from you.  For those simply wanting a little advice please check out our blogs, videos and social media links for lots of the latest tips and information to get you looking and feeling great.

We look forward to welcoming you to Team NK!

Our services

Making Your Goals a Reality

Meet your team

Professional trainers to help you achieve your goals

Nathan Kelly

Nathans experience is second to none. With the ability to improve even the fittest person it's clear to see why so many professional athletes train with Nathan.

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David Thomas

David is a results driven personal trainer who delivers on your goals and provides you with a change in lifestyle as well as exercise.

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Sophie Pascall

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Toby Williamson

Toby's passion for fitness and a healthier lifestyle is very addictive. With his support and knowledge you will meet your goals and sustain them.

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See what our amazing clients have to say about us

I have been attending Boot Camp now for 6mths. I totally enjoy every minute even when i feel i cannot do anymore but Nathan gives us such enthusiasm and makes me want to work harder. He puts a lot of thought into what we are doing each week. My body is always aching the next day which is a sure sign of a good session!

Jo Welch
Jo Welch

I've been having PT sessions with David for the last 8 months. I've found them tough but enjoyable and can see results in my body shape and tone. David is a bit of a gentle giant but don't take that to mean he's a pushover - he's every bit the hard task master you want when doing personal training! I would thoroughly recommend NK Fitness - try it for yourself!

Lucy Patchin
Lucy Patchin

I have been with David Thomas for more than a year and I highly recommend him to anyone who's interested in improving their fitness level in a safe and sustainable way. He is also a very friendly, understanding and easy person to work with, which are essential qualities in any personal trainer.

Sengyim Ng
Sengyim Ng

I have been training with Nath and NK Fitness regularly for three years now and have nothing but good things to say.

Sessions are well thought out and individual drills/exercises are effectively demonstrated to ensure you get maximum benefit from your training time.

Nathan's sessions offer great variety, rarely are two sessions the same which really helps to keep you engaged and working hard!

Nathan is hugely knowledgeable and will always offer support and advice in all aspects of your training.

His professional and friendly approach ensures that you both work hard and enjoy your sessions

Marc Wilson
Marc Wilson

Fantastic experience being coached by Nath Kelly. I was lucky enough to do a strength and conditioning program with him whilst studying at college. The results I seen were outstanding and my performance surpassed my expectations. 6 years on I am still using these sessions to keep me in shape. Nath really made training fun, fresh and exciting. Naths background knowledge is phenomanal and I honestly haven't come across a more enthusiastic coach since.

Scott Stitt
Scott Stitt

I asked you to sort out my upper body and you delivered! But you also made me do legs too to achieve the balance. Your professional expertise made the difference and you provided the motivation to make me stick to the plan. You varied the exercises each time so that I wouldn't get bored, and you provided your philosophical take on life for free!
You've been a great friend in the process.

Julian Cox
Julian Cox

Highly recommended!
I teach, perform and have competed professionally in Pole & Aerial Fitness but after hitting a plateau in my training I needed that extra push to reach the next level, David has been brilliant at developing a personalized plan to help me further progress, achieve my goals, and complement my current training. PT sessions with him are always something to look forward to, tough but fun, and most importantly gets results! My strength and flexibility have vastly improved, which has been of great benefit to me in my pole and aerial work. Along with his nutritional advice and recommended changes to my diet, I feel more energized; I’ve lost body fat and increased muscle mass. Win win!

Miranda Goldring
Miranda Goldring

Hi, in last year my fitness instructor was David Thomas. His professional knowledge and experience in fitness make hard work very easy for me. He was very easy to work with and I want to come back for more session. He help me with my cardio and overall fitness. Thanks Dave for good year.

Krzysztof Wegrzynowski
Krzysztof Wegrzynowski

cant thank Nath enough for all the hard work and advise he has given me over the last couple of weeks getting me this new programme to work around my old one , he certainly is top of his game very knowledgeable in all aspects of fitness , I would defiantly recommend him and NK fitness

Lindsay Pearce
Lindsay Pearce

Had a great group session with Nathan last week. He was up beat and encouraging, there was no standing around - kept the different exercises quick and varied and most of all it was a great laugh. Good all round workout focussing on all areas of the body. I was very impressed and highly recommend NK Fitness.

Catherine Devine
Catherine Devine

Had a great time when I stayed in Ascot, Nathan really put me through my paces and really understood what I needed. Some great nutrition tips to! he is the best personal trainer in Ascot!

Steven Trask
Steven Trask

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