A, because in all, stretching is to reduce muscle tightness and relax muscles. It also can be used as a warm up for sport activities, like a jog, or running a mile, etc.
It's also used a stretch warmup by P.E. Teachers sometimes. If you search up dynamic stretching it shows many stretches, and people do these all the time to prepare for exercise, or to loosen up tight muscles.
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The answer to the above question is power
An under the tongue or in the ear thermometer since they are pretty self explanatory or a forehead thermometer if the ears are sensitive.
