PowerBar IsoActive

£21.99 (1.32kg tub), wiggle.co.uk

This powder, easily mixed with water, has a glucose/ fructose mix that the brand calls ‘C2MAX’, because it maximises the amount of energy that the body can convert into energy. It also contains five essential minerals lost through sweat, such as sodium, potassium and magnesium – essential for hydration and to help prevent cramp.