The Hatha approach is opening the pranic body (energy channels, chakras) which purify body and mind bringing us into the ‘infinite’ experience of no body/mind. Focussing through the breath (this is pranayama) starts the purification process.
Making sure movements and postures do not restrict the body or lessen breathing, (lessening the ego- restlessness).
Also by releasing the clinging of ego aspect prana expands (energy/ lifeforce).
Many physical benefits are bound to happen but only by lessening the “I want to be better”
It is the realisation of the underlying reality of consciousness of life ( the infinite within of consciousness) that brings peace and calm in mind.
Om Shanti