The basis for all creation, including the physical body, is the group of five elements: earth, water, wind, fire, and space. The wellbeing of the body and mind can be established by purifying these five elements within the human system. This process also shapes the body into a stepping stone towards one's ultimate well-being.
There is a whole system of yoga called Bhuta Shuddhi, which "purification of the elements." The Bhuta Shuddhi processes offered by Isha provide a unique opportunity for everyone to benefit from this esoteric yogic science, which otherwise requires intense sadhana(spiritual practices).