What to eat to boost your fitness

3. Beet It Pro Elite Flapjack

This high-nitrate fitness bar contains a special key ingredient – beetroot, which naturally helps to boost strength and sporting performance by acting as a vasodilator – to increase blood flow and oxygen supply to the muscles. The compact bar contains around half a litre of beetroot juice, along with oats, to improve endurance. We swear by it!

£1.95, beet-it.com