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science 40muscle building 22muscle cramps 4interviews 13expert advice 13pro tip 13pro athletes & teams 6test winner 2recovery 10race nutrition 31endurance performance 32weight loss 8energy & carbohydrates 16fat metabolism 6fluids 14health 28immune system 21protein 24performance optimisation 31strength 12caffeine 10creatine 4race preparation 10blood flow 2amino acids 8infographic 18comparison/overview 12iron 4