The body uses two main macronutrients to derive energy to fuel an activity, namely carbohydrates and fats. The former being the preferred source of quick energy, and the latter for sustained energy provided that the body can process fats for fuel. It is easier to run out of carbohydrates, which are stored in the muscles in the form of glycogen. Glycogen is a localized energy store that can only be used by the muscles in which it is locked. When these glycogen stores are depleted muscles get fatigued, this is referred to as ‘bonking’. A way to minimize glycogen depletion, and therefore fatigue, could be to consume adequate carbohydrates, before and during a ride.