Andy Blow is the founder of Precision Fuel & Hydration, a company that makes sports supplements for endurance athletes. He has a BSc Honours degree in Sports and Exercise Science from the University of Bath and has co-authored a number of scientific studies and books. He was once the Team Sports Scientist for the Benetton and Renault Formula 1 teams and remains an adviser to the Porsche Human Performance Centre at Silverstone. Andy has finished in the top 10 in Ironman events and won the XTERRA Age Group World title.  On the episode we talk about Andy’s sporting background and how it led him to setup Precision F&H. We then talk about hydration, electrolytes, sweat testing, peeing during exercise, and calibrating hydration to your personal needs. Then it’s onto fuelling, carbohydrate intake for energy and recovery, with examples of where the low-carb and high carb approach have seen results. Check out the below links to articles on the Precision F&H website (authored by Andy) that cover many of the topics discussed in this episode.  Measure your sweat rate - https://www.precisionhydration.com/performance-advice/hydration/how-to-measure-your-sweat-rate/ How Much Dehydration Can you tolerate - https://www.precisionhydration.com/performance-advice/hydration/how-much-dehydration-can-you-tolerate-before-your-performance-suffers/ Nutrition Endurance per -  https://www.precisionhydration.com/performance-advice/nutrition/nutrition-endurance-performance/ How Much Carbohydrate do you need?  - https://www.precisionhydration.com/performance-advice/nutrition/how-much-carbohydrate-carbs-athletes-per-hour/