Yoga can hardly be considered an effective form of exercise. This type of activity has been around for hundreds of centuries. It is still popular and many people love it. They improve their health, strengthen their bodies, mind and spirit. Some yoga poses are hard and physically rather challenging. However, it does not make yoga good enough to build lean muscle. Yoga cannot burn fat or speed up your youth-enhancing hormones. Do not expect to look younger even after a year of practicing yoga. It may only can help to increase your flexibility. You will learn to calm your mind and get rid of spiritual tension, but this kind of activity will not stimulate your youth hormones.