The underlying purpose is to perfect the body, making it a worthy host for the soul. The posture exercises not only work the physical aspect but the mental aspect of heath as well. Meditation supplements and reinforces the disciplines fo hatha yoga, focusing the mind and relaxing the body. Closely linked with focused breathing, it aims to produce a quiet, calm frame of mind. Many people find that it reduces stress and increases energy.
Meditation is probably the crux and fundamental value of yoga therapy.