I think both boys and girls should stretch, because the muscles formed without stretching after this kind of exercise will not have particularly beautiful lines, and even exist like a lump, which is not beautiful at all, so you must fully stretch after exercise.
Now many girls exercise like this, because they want to lose weight, so they go to the gym to exercise themselves. If you hire a coach, the coach may tell you to stretch after exercise, but if you practice by yourself, few of us will remember stretching, especially when we are tired after exercise, and we don't even think of stretching.
Moreover, because the exercise does not stretch in time, our muscles will form a sore state the next day, and this state will not feel good. Stretching is mainly to pull our stiff muscles apart, so it won't be very troublesome. We can simply do a few actions. The first action is that we step forward with one foot, then step backward with the other foot, then lean forward as far as possible, and continue this way with the other foot after several groups.
This action can effectively help us stretch our legs and avoid forming ugly muscle legs after long-term exercise. The second action is mainly aimed at the muscles of our hands, and the stretching of our hands is relatively simple. We can cross our hands up and then cross our hands down, which can exercise hand lines well and stretch our hands effectively.