Useless, not recommended! When exercising, the most important thing is to stretch freely without restriction, so that every movement can reach a standard angle, the speed of burning fat will be accelerated, and the amount of perspiration will be large. However, if the underwear is high in the waist, the abdomen is tight, and the exercise is very tired, there is no way to reach the standard for a long time. You won't stick to it for a while, which is not conducive to losing weight at all. You see, those who do yoga have loose clothes, great elasticity and strong sweat-absorbing function, and do not wear body-shaping clothes to keep fit. But after exercise, when you have a rest at night, you can wear clothes for a few hours, so you can get in shape. I wish you more and more health and beauty!