Shatkarmas and Asana purify the body. They build awareness. Awareness sharpens the senses. Regulating the breath increases our ability to produce the agni.
The mind emerges the energy of the soul. This spiritual force is the most healing, for ourselves and others.
The brain and the vital inner organs get most of the energy to sustain their healthy function. This leads to the drying out of our essential fluids, nutrients and tissues, including the Ojas. Yoga is one of the many disciplines which teaches us the various techniques of slowing down the depletion of our vital tissues.