I also found that many people who work out in the gym pay attention to the exercise of the upper body and ignore the lower body. There are many reasons. I can sum up as follows:

Upper body exercise is relatively less boring and hard, and leg squatting is very hard for many people;

Some people think that aerobic exercise and running have developed legs;

The results of upper body exercise are easy to be concerned by everyone. For example, the muscles between friends are all shown in the upper body. In addition to swimming, I usually look at the upper body with bare arms at most, so the performance of the upper body is also concerned.