CongratuLATIONS to Tom Evans and Ruth Croft, Winners of UTMB 2025.

thank you for trusting me. I’m proud to be part of your team.

I specialise in endurance and ultra-endurance sports, working with individual elite athletes, teams and organisations. I advise and consult on performance nutrition and physiology.

I only take on a small number of clients at a time. I work within the Salomon International Team as Lead Nutritionist, in addition to working with several elite triathletes and trail runners.

My PhD and research work explores substrate metabolism and fuelling in ultra-endurance.

If you would like to work with me as a consultant for an individual athlete or team, feel free to send me an email or visit my Instagram account.

Paul Booth

Nutrition and Performance Consulting Services for Individual athletes, teams and organisations.

work with me

I offer a range of services and plans, including performance and race nutrition, physiology testing, and consulting. Click for more details and prices.

Are you an Elite or High Calibre Trail and Ultra Runner?

I’m looking for experienced athletes to take part in my next field based study in the Lake District, UK, in October 2025

What’s the Commitment:

You will be required for two weekends in October 2025 to run a 50K simulated ultramarathon in the Lake District. On each occasion, you will take a different dose of carbohydrates.

Here’s What You Get:

  • Part of a groundbreaking study into carbohydrate research. I will help you assess your fuelling needs during competition and review muscle damage.

  • £500 of lab testing, including a DEXA scan, VO2max test, and Lactate Threshold test to assess your zones.

  • Advice on results and fuelling for your next race with me.

To Find Out More:

Please send an email to paul@performancegains.co.uk and we will organise a chat.

Who am i?

I’m Paul. I’m a qualified Sports and Performance Nutritionist, Exercise Physiologist, Academic, and PhD Researcher in Trail and Ultra Endurance Physiology and Metabolism. I’ve been trail running for over two decades, competing in my first ultramarathon 20 years ago. In the years since I’ve completed 89 ultras, and over 150 trail/fell races, road marathons, cycling, ski, and Ironman triathlon events. I’ve competed in races such as UTMB, long-distance challenges such as the Bob Graham Round, bikepacking races and alpine fastpacking expeditions.

This is me travelling hut-to-hut on the Dolomites Alta Via 2 route.

In 2025 my race calendar includes Ultra Trail Snowdonia, Laveredo, and Eiger Ultra Trail.

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