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A woman who has been running three miles several times a week for eight weeks finds that the muscular endurance of her legs has increased noticeably but that there has been little change in their strength. This runner's experience can best be used to illustrate which of the following principles of exercise training?
During exercise, muscular contractions make cells more permeable, thus allowing glucose to be more easily transported from blood plasma into muscle cells. This is an important reason why exercise is especially beneficial to people with: