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science 43muscle building 21muscle cramps 4interviews 10expert advice 13pro tip 12pro athletes & teams 2test winner 1recovery 10race nutrition 36endurance performance 38weight loss 9energy & carbohydrates 16fat metabolism 6fluids 18health 32immune system 22protein 24performance optimisation 32strength 13caffeine 12creatine 6race preparation 11blood flow 3amino acids 12infographic 19comparison/overview 11iron 4