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science 41muscle building 22muscle cramps 4interviews 15expert advice 13pro tip 13pro athletes & teams 7test winner 2recovery 10race nutrition 31endurance performance 32weight loss 9energy & carbohydrates 16fat metabolism 6fluids 14health 29immune system 21protein 24performance optimisation 31strength 12caffeine 10creatine 5race preparation 10blood flow 2amino acids 8infographic 18comparison/overview 12iron 4