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science 45muscle building 21muscle cramps 4interviews 9expert advice 13pro tip 12pro athletes & teams 1test winner 1recovery 10race nutrition 36endurance performance 38weight loss 9energy & carbohydrates 16fat metabolism 6fluids 17health 31immune system 21protein 24performance optimisation 35strength 13caffeine 13creatine 7race preparation 11blood flow 4amino acids 12infographic 18comparison/overview 11iron 4