The elements are important for the existence of 3D reality.
One can elect to be the personal envoy of their own health.
Yoga and alchemy are practices of transformation. Through them, one endeavors to dissolve the ego self and to go beyond the mundane centered nature imbued therein.
There is a train of thought in some yoga circles that using props in this pose must adhere to certain strict guidelines. Placing a block between the knees provides a different kinesthetic stimulation to the body.