Ron Maughan obtained his BSc (Physiology) and PhD from the University of Aberdeen, and held a lecturing position in Liverpool before returning to Aberdeen where he was based for almost 25 years. He is now a professor at Loughborough University, UK. He has published extensively in the scientific literature, and is on the editorial board of several international journals.Susan Shirreffs is a lecturer at Loughborough University, UK. She specialises in hydration and is the theme leader of the sport and Exercise Nutrition Theme of The Nutrition Society.