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Message: [QUOTE="tbonezone, post: 1318367, member: 1028"] it's basic metabolism. the muscles can only store so much fuel and when it's gone the only way to replace it is rest. Muscle is capable of burning multiple fuels during exercise, including glucose , fatty acids and amino acids. that's why you don't see people sprinting marathons. you have to conserve your energy supply to finish. so you pace yourself accordingly.simple translation: not go 100%. nascar is racing in atlanta today. watch how quickly better cars get run down by those with fresh tires. [/QUOTE]