Asanas are for making one comfortable during long practices of dhyaan.
Yoga Asanas improve mind , body ,senses coordination. But at the time of death dhyaan takes us to the next level. As we practice more of this concentration exercise better we gain knowledge of our inner silence and the power of voidness.
In dhyaan we leave body as it is , this built up detachment during pains and deterioration of it. Then body problems are no more your problem. Mind is not analysing body’s status infact mind and intellect becomes servant of the SELF state .
Now importantance is to stay in the SELF state -mind and intellect job profile has changed. They are no more busy in gratification of body needs , now they serve SELF.