Athletes who exercise regularly are able to exercise for longer,partly because their body is able to use more energy from

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Regular exercise increases the body's ability to use energy from fat.This spares glycogen stores,and exercise can continue for longer.Protein and amino acids are used only when glycogen and glucose (carbohydrate)stores are exhausted;this would take longer in athletes who exercise regularly.

Athletes Who Exercise Regularly Are Able to Exercise for Longer,partly