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

I currently work with the Salomon International Team and UTMB 2025 winners Tom Evans and Ruth Croft. 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

Performance Nutritionist, Exercise Physiologist, and consultant.

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 over two weekend days in October 2025 to run a short simulated ultramarathon in the Lake District. On each occasion, you will take a different dose of carbohydrates.

Here 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.

To Find Out More:

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

services and Plans


Elevate your endurance game with the “Ready to Race” plan, a series of one-to-one nutrition coaching sessions, personalised around your competition goals and ambitions. Each session will focus on the specific areas where you need help, and every session will include a range of resources and tasks to complete - including reviewing and optimising your training diet, effective fuelling, improving recovery, choosing supplements, gut training, hydration tracking and planning, race nutrition prep, race nutrition planning, increasing your practical and scientific knowledge of sports and performance nutrition.

How Does It Work:

Over 6 x 90-minute sessions (more if required/requested) we cover all the key areas you need to enable nutrition to make a positive impact on your health, performance, training adaptation, recovery, and competition success. We cover the key areas of nutrition for performance. Many athletes come to me with specific needs, such as reducing gut distress during competition, improving race fuelling, or enhancing recovery. Therefore, as personalised plan, we can continually adapt and focus more time on the areas we feel are most important for your success.

What We Cover:

We deep dive into your current eating habits and identify areas of best practice, and those that need improvement, to optimise your diet and health. We move on to fuelling training and recovery. Once we have your diet set up, we focus on race nutrition and hydration, building up a plan for competition whilst working on some gut training protocols and hydration planning.

This plan can be taken over a period of 12 months if needed, allowing you time to work on tasks and plans to be race-ready.

Due to demand, I am only taking on clients through referrals at the moment. However, feel free to contact me on Instagram if you have any questions or would like to be added to the waitlist.


“Ready to Race” Trail and Ultra-Marathon Structured Nutrition Coaching PLAN

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’m Lead Nutritionist for the Salomon International Team, and a consultant for other elite and sub-elite athletes and teams. I’ve been trail running for over two decades, competing in my first ultramarathon 20 years ago. In the years since I’ve completed 88 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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