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science 39muscle building 23muscle cramps 4interviews 13expert advice 12pro tip 13pro athletes & teams 6test winner 2recovery 10race nutrition 31endurance performance 32weight loss 8energy & carbohydrates 16fat metabolism 6fluids 14health 27immune system 21protein 23performance optimisation 31strength 13caffeine 9creatine 5race preparation 10blood flow 2amino acids 8infographic 18comparison/overview 12iron 4