What is Yoga?
Yoga means a bringing together of the parts of the body in order to create a union or balance of a persons body,mind and spirit. We can define Yoga in many ways. Actually the word Yoga derived from the Sanskrit word "yugira" which means union. So the word Yoga has given 3 different meanings namely Apaya (means), Samyoga (union), and samaadhi / samadhi (absolute union).
Yoga is a process of gaining control over mind.
One who indulges properly in Yoga is defined as the effects of Karma/action. So the perfection of action is Yoga.