Older sisters running a marathon in tight-fitting clothes in an unpopular place. Observing the older sister running while writhing in pain, she was wearing no bra! When a pelvic correction teacher advertised in a women's magazine that ``tightening the upper body is not good,'' jogging without a bra began to become popular. In the case of no bra, it seems that body fat and stress values are reduced, but there was another effect that even the pelvic correction teacher could not imagine. It is the effect that the nipple rubs and it feels good, and you want Ji Po ….