Yoga is one of the most ancient cultural heritages of India. The word yoga in Sanskrit means "to unite" and so yoga can be said to connote a unitive discipline. In this sense it is an exercise in moral and mental cultivation that generates good health (arogya), contributes to longevity (chirayu), and the total intrinsic discipline culminates into positive and perennial happiness and peace. Therefore, yoga is said to be indispensable to the ultimate accomplishment in life. It is a science that affects not only the conscious self but the subconscious as well. Yoga is an all-embracing way of life, a science of self-culture and mental discipline that ensures the purgation of the ignoble in man and brings forth what is most noble in him. It is pertinent to all people irrespective of caste, creed, sex, and religion. It can be beneficial to all - the good and the bad, the sick and the healthy, the believer and the non-believer, the literate and the ignorant, the young and the old. A person may begin at any age and can go on reaping its benefits. Definition of yoga- Yoga is cessation (nirodha) of the mind modification.