Heat makes every watt cost more. Here is what happens to your body when racing in the heat, plus practical protocols for acclimation, hydration, sodium and fuelling.

Learn when to take caffeine during a marathon, 70.3, Ironman or ultra — most athletes take their last dose too late to get the full benefit.

A quick guide to Precision Fuel & Hydration's gel range – which format suits which race, effort and moment. Find your best energy gel for endurance here.

Scroll far enough through endurance training content and you'll meet the same promise, dressed up in different clothes: a named interval protocol, a scientific citation, and the quiet implication that this is the one combination of work and rest that...