Fuelled by Science, Trusted By Elites, Proven By Performance Featured Articles Marathon Training How to Fuel Your Autumn Marathon Most runners dial in their marathon nutrition during hot summer training, when high temperatures reduce carbohydrate absorption and trigger gut ... 12 minutesJonah Rosner Marathon Training So, You're Running the Chicago Marathon? Hopefully, you've already been practicing your strategy and have a plan in place ready, but just in case, we've asked ... 3 minutesJonah Rosner Cycling Fuelling the Comeback: Rehab, Rebuilding, and Resilience When an avalanche swept elite athlete and mountain guide Ross Hewitt over exposed rock on Mont Blanc, surviving was only ... 7 minutesSiS Team 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 Articles by sport Running Cycling HYROX Swimming Triathlon Football Basketball Rugby Other Sports Latest Articles Marathon Training How to Fuel Your Autumn Marathon Most runners dial in their marathon nutrition during hot summer training, when high temperatures reduce carbohydrate absorption and trigger gut ... 12 minutesJonah Rosner Marathon Training So, You're Running the Chicago Marathon? Hopefully, you've already been practicing your strategy and have a plan in place ready, but just in case, we've asked ... 3 minutesJonah Rosner Cycling Fuelling the Comeback: Rehab, Rebuilding, and Resilience When an avalanche swept elite athlete and mountain guide Ross Hewitt over exposed rock on Mont Blanc, surviving was only ... 7 minutesSiS Team 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 0Load More The Experts Professor James Morton Director of Performance Solutions SiS Team The Experts SiS Contributor Guest Author An Expert 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 Anna Hickling Running & Marathon Contributor William Wright Cycling Enthusiast & Content Creator Paul Murphy In-House Editor Graham Wilson Team Sports Specialist Jessica Palmer Nutrition & Performance Contributor
