The sanskrit word yoga comes from the root yuj means to join or unite.Yoga is having eight limbs or stages.
One who attains the top level yoga called Yogi was explained as follows:
One who works in devotion, who is a pure soul, and who controls his mind and senses is dear to everyone, and everyone is dear to him. Though always working, such a man is never entangled.(B.G 5-7 Translation by A.C Bhaktivedanta Swami Srila Prabhupada ).But usually only the Asanas are more concentrating. But full meaning of Yoga improves a person to an higher platform.
We are teaching the Yogasanas for the patients to improve from the health issues.