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science 37muscle building 23muscle cramps 4interviews 13expert advice 11pro tip 12pro athletes & teams 7test winner 2recovery 10race nutrition 31endurance performance 32weight loss 9energy & carbohydrates 16fat metabolism 6fluids 14health 23immune system 17protein 24performance optimisation 29strength 13caffeine 8creatine 5race preparation 10blood flow 2amino acids 8infographic 18comparison/overview 12