Proper hydration is crucial for maintaining the body's chemical reactions and temperature regulation. This need intensifies during high-intensity cycling when sweat loss escalates dramatically.

Interested in learning how to start cycling? We explain everything you need to buy and learn to go from beginner to expert.

Hugh loves to cycle, David is less keen. But together they set out on an epic journey to ride across France in this new, four part series, showing on More4. Keep reading as we explain how to watch ...