2. Breaststroke mainly exercises leg muscles. Breaststroke is the easiest stroke to learn. Breaststroke has few movements and less skills than other strokes. You just need to open your thighs completely and cooperate with your hands. Breaststroke requires full extension and contraction of the thighs and constant opening and closing of the legs. This action can effectively exercise leg muscles, especially thigh muscles, and effectively improve leg strength. In addition, in the continuous leg opening and leg closing movements of women's breaststroke, pelvic muscles and perineal muscles will get a lot of exercise, which can enhance women's sexual ability and make it easier to reach orgasm in sexual life.