A warm up consist of a period of non-strenuous activity that slowly prepares the body for more vigorous exercise.
Most warm up will gradually increase in intensity. The muscle which was used can be different for each activity. <span>Not only athlete, </span>singer can do warm up too.
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Physical therapy is the biggest area of speciality for physicians.
The answer is B: fat gives your body energy to function, while muscle mass is used only to perform strenuous activity. This option is only correct because the statement includes the words, "muscle mass." If it was only "muscle," then it would be wrong.
