Jack Rees

Coach

My passion lies in continuing to support athletes as they chase their goals, while contributing to the growth of Optimal Endurance as a vibrant and inclusive endurance community.
COACHING SERVICES

Bio

Jack and Ross at he Mallorca training camp
Endurance sport has been at the heart of my life from a young age. I began as a swimmer before discovering triathlon at 14, which soon led to a deeper focus on cycling by the age of 16. From 18 to 21, I studied Sports Coaching on a cycling scholarship at the University of Central Lancashire. After graduating, I dedicated the next decade to racing at a professional level, eventually founding and competing for the Ribble Weldtite Pro Cycling Team.

During the Covid-19 pandemic, I returned to triathlon, earning podium finishes at events like Ironman 70.3 Egypt, and setting the fastest age-group bike split at several Ironman and Challenge-branded races.

Today, I split my time between racing at a national level in the UK and Europe, working with Optimal Endurance and British Cycling, and managing sponsorship and athlete partnerships for a number of endurance sport brands. I’m also currently studying for an MBA in Senior Leadership.

Coaching Philosophy

My coaching is rooted in science and built on strong personal relationships. I believe in taking the time to truly understand each athlete—their goals, their lifestyle, and what drives them—so I can develop training that’s both effective and sustainable.

I work with athletes across the endurance spectrum, from novice to elite, and take an event- or goal-specific approach to planning. Every programme is individually tailored, with clear focus on balancing performance ambitions with everyday life.

My passion lies in continuing to support athletes as they chase their goals, while also contributing to the growth of Optimal Endurance—not just as a coaching provider, but as a vibrant and inclusive endurance community.
Jack and Ross
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My Goals


Ready to Join?
Helping athletes achieve long-term ambitions in long-distance triathlon
Guiding individuals to personal bests and ambitious stretch goals
Implementing cutting-edge scientific methods to maximise performance, even when time is limited
Building strong, meaningful relationships and taking genuine pride in athletes’ success

TESTIMONIALS

Fransisc

FRANCISC

Long Distance Triathlete
"5 years and still going, in that time I have progressed on all fronts. This year I took on my first full distance IRONMAN in Copenhagen. The planning of training around my work/life and adjustments meant I was able to stand on the start line fit and healthy and execute a race way beyond what I thought was achievable."
Russell Running

RUSSELL

Long Distance Triathlete
"We have worked together for 12 months. The big goal for 2024 was performing in Hawaii for the IRONMAN World Champs. The attention to detail on the specifics of the race were amazing!! I have improved across swim/bike & Run, I have also got a lot stronger in the gym with some specific focus. I can't wait to get stuck into 2025 and beyond."
Coach Joe encouraging Katie

KATIE

Runner & Triathlete
"In 2021 I worked with Optimal Endurance to complete a full distance IRONMAN in Tallin. The training was focused, I had a clear plan on race day and I finished in 10hr 53mins!! I enjoyed the process of translating my running background to triathlon. If you want to improve across Swim/Bike/Run this is the team for you."
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OTHER COACHES

Triathlon Training Tapering

Ross Harper

Founder
Optimal Endurance Club

Brett Halliwell

Triathlete

Paulina

Triathlete
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