Regular exercise or athletic sport is focused on burning calories and building the muscles. Yoga considers the physical body a vehicle for the expresson of the soul. You are not your body. There is soul that dwells in that body which is of utmost importance. Yes we will take care of th body. Hatha yoga helps the body to change at the cellular level. Emphasis on stretching with full awareness on breath ,which helps remove the impurities from intercellular and intracellular level. Balancing, inverted postures will help the mind to be quiet,centered and  peaceful. One will be able to handle the stress constructively. It will make the body supple and strong at the same time. Suppleness is the key to rejuvination.