The first kind of person is pregnant. Do we need to explain this? The exercise in the gym is intense and the intensity of exercise is not small, which is not suitable for pregnant women who should be static. Of course, pregnant women don't have to be honest all the time and can't take part in any sports. All living things need exercise, even pregnant women.

The second kind of person is a weak person. If they are too weak, how can they finish the project in the gym? So the body is really too weak, there is no need to embarrass yourself. If we want to keep fit, we should at least have the same physical fitness and at least be able to bear some basic weight.

Old people need to be cautious in fitness. Although many old people are more energetic than young people, they are weak after all. It is best to exercise carefully, especially when doing anaerobic training, and we must consider the aging of the body and whether the physical quality can withstand anaerobic exercise.