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.
Causes a struggle or irritates you to where you can't bear it
Positive: eating healthy, drinking lots of water, stretching before working out
Negative: eating junk, drinking sugary drinks, not stretching before working out
This is confirmed to be True.
