Fuelled by Science, Trusted By Elites, Proven By Performance Featured Articles Running The Role of Sodium in Endurance Performance Most Athletes Overlook Sweat sodium concentration varies enormously between individuals, far more than most gym goers, team sport players, and endurance athletes ever ... 4 minutesSiS Team Running What the Research Says About Caffeine and Athletic Output Caffeine is the most studied ergogenic aid in sport, and the evidence for it is stronger than almost anything else. 4 minutesSiS Team Running What Dehydration Actually Does to Your Performance Numbers Even 2% body water loss measurably degrades speed, strength, and decision-making, the data is more alarming than most athletes realise. 4 minutesSiS Team Running How Hot Weather Training Changes Your Electrolyte Requirements Training in heat doesn't just mean drinking more, it means replacing a completely different electrolyte profile. 3 minutes SiS Team Ultramarathon Training Josh Wade's Road to Chamonix In elite ultra-trail, the UK’s Josh Wade has become a byword for consistency, delivering numerous top 10 finishes over the last few seasons. Read his interview of fueling for ... 6 minutes SiS Team Ultramarathon Training Fueling UTMB: What The Mountain Asks Of You Most runners look at a 174-kilometer mountain race and see an aerobic engine problem. Build the heart and lungs, log ... 9 minutes SiS Team Running Top Tips For Racing During UTMB Week Running in Chamonix is the highlight of many trail runners season, but there is so much more to ultramarathon trails ... 4 minutesSiS Contributor Guest Author Running Why Team Sports Athletes Need a Different Nutrition Plan to Solo Athletes Intermittent sprinting, positional demands, and shared training schedules change everything about how you should eat. 4 minutes SiS Team Running Why Carbohydrates Are Still the Most Misunderstood Fuel in Sport Despite decades of research, carbs remain the most argued-over macronutrient in athletic performance, here's what the science settles. 3 minutes SiS Team Articles by sport Running Cycling HYROX Swimming Triathlon Football Basketball Rugby Other Sports Latest Articles Running The Role of Sodium in Endurance Performance Most Athletes Overlook Sweat sodium concentration varies enormously between individuals, far more than most gym goers, team sport players, and endurance athletes ever ... 4 minutesSiS Team Running What the Research Says About Caffeine and Athletic Output Caffeine is the most studied ergogenic aid in sport, and the evidence for it is stronger than almost anything else. 4 minutesSiS Team Running What Dehydration Actually Does to Your Performance Numbers Even 2% body water loss measurably degrades speed, strength, and decision-making, the data is more alarming than most athletes realise. 4 minutesSiS Team Running How Hot Weather Training Changes Your Electrolyte Requirements Training in heat doesn't just mean drinking more, it means replacing a completely different electrolyte profile. 3 minutes SiS Team Ultramarathon Training Josh Wade's Road to Chamonix In elite ultra-trail, the UK’s Josh Wade has become a byword for consistency, delivering numerous top 10 finishes over the last few seasons. Read his interview of fueling for ... 6 minutes SiS Team Ultramarathon Training Fueling UTMB: What The Mountain Asks Of You Most runners look at a 174-kilometer mountain race and see an aerobic engine problem. Build the heart and lungs, log ... 9 minutes SiS Team Running Top Tips For Racing During UTMB Week Running in Chamonix is the highlight of many trail runners season, but there is so much more to ultramarathon trails ... 4 minutesSiS Contributor Guest Author Running Why Team Sports Athletes Need a Different Nutrition Plan to Solo Athletes Intermittent sprinting, positional demands, and shared training schedules change everything about how you should eat. 4 minutes SiS Team 0Load More The Experts Alec Fenn Health and Fitness Journalist and Copywriter Dr Emily Jevons Registered Nutritionist Professor James Morton Director of Performance Solutions SiS Team The Experts SiS Contributor Guest Author An Expert Renee McGregor Clinical Director & Sports Dietician Jonah Rosner Applied sport scientist, strength and running coach Dr Marc Fell Senior Performance Nutritionist Lauren Charlton, MS RDN Registered Sports Dietitian Nicola Joyce Guest Author Fitness Industry Copywriter & Coach
