If you exercise for an extended period of time, you will use energy first from _______, then from _______. A. Fats; glycogen B. Proteins; fats C. Glycogen; proteins D. Fats; proteins E. Glycogen; fats.
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The primary source of energy during exercise is carbohydrates, which are stored in your muscles and liver as glycogen. So, the first source of energy during exercise is glycogen. As you continue to exercise, your body starts to break down fats to provide Show more…
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