SWIM & WATER POLO
A national-level youth swimmer and water polo player, building the technical and competitive foundation that shaped everything that followed.
Meet your coach
I'm Alex Foster, an endurance coach, lifelong competitor and firm believer that every session should have a purpose.
British Triathlon qualified, with more than a decade of coaching experience and 15 years competing at a high level across triathlon, I bring the athlete's perspective into every plan.

Why I coach
Coaching began in 2016 through voluntary triathlon coaching. What started as a way to share experience quickly became the most rewarding part of the sport.
As the number of athletes grew, so did the enjoyment of being part of somebody else's progress. Supporting beginners through their first event and helping experienced athletes compete for race wins gradually took priority alongside my own athletic ambitions.
That community became Tri Fit Coaching: a team of like-minded people working toward very different goals, but sharing the same commitment to progress. FASTR Performance is the next stage of that journey.
Coaching is helping each athlete progress in whatever way I can. Most often, that means making purposeful training work around real life.
The athlete behind the coach
Years of racing, learning and adapting across endurance sport shape how I understand the demands placed on the athletes I coach.


A national-level youth swimmer and water polo player, building the technical and competitive foundation that shaped everything that followed.
Fifteen years competing at elite and national age-group level, representing Great Britain at European and World Championships and winning the British Championships in 2015.
Moving into HYROX in 2024 brought a new multi-discipline puzzle. In 2026, I represented Great Britain at the HYROX World Championships.
What success means
Winning matters, but it is not the only way to measure success.
Success might be a podium, a personal best, moving from HYROX Open to Pro, or hearing “you are an Ironman” for the first time. The goal we agree at the beginning becomes our shared definition of success.
How I coach
The best plan is not the one that looks most impressive on paper. It is the one that fits the athlete, can be executed consistently and keeps evolving as performance changes.
Progressive training structured around the time, work, family demands and facilities you genuinely have available.
TrainingPeaks, session feedback and performance data guide the plan and help every phase move in the right direction.
Movement and technique analysis, delivered remotely or in the FASTR Performance Lab, finds efficiency that the stopwatch alone cannot show.
Practical training and event-fuelling guidance supports the work, recovery and race execution the plan demands.
Why FASTR
Tri Fit Coaching built the team. FASTR Performance better reflects the athletes, sports and ambitions that team now represents.
HYROX and triathlon share more than first appears: multiple disciplines, individual strengths and weaknesses, endurance under fatigue and the need to piece every part of the training puzzle together. Running sits at the heart of both.
FASTR brings that wider endurance and hybrid-performance focus under one name without losing the community, individual attention or enjoyment that coaching was built on.
Your next chapter
Tell me what you're training for, where you are now and what you need help with. We'll work out whether FASTR is the right fit.
Start your journey