Really speaking therapy is not a field of Yoga in its proper sense. Even so, Yoga has necessarily to do with health activities. How these two are related, and in what way, we shall try to see in the following.
Yoga is thus an integral subject which takes into consideration man as a whole.
It does not divide him into water-tight compartments as body, mind, spirit etc. Human body is a miniature universe itself. The health of mind and body is one such. A healthy mind and healthy body are, in fact, considered as essential pre-requisites to the higher practices of Yoga. These constitute what is known as Kriya Yoga in Yogic parlance.