Yoga is a way of life, an art of righteous living or an integrated system for the benefit of the body, mind and inner spirit. This art originated, was perfected and practiced in India thousands of years ago. The references to yoga are available in 'Upanishads' and 'Puranas' composed by Indian Aryans in the later Vedic and post- Vedic period. The main credit for systematizing yoga goes to Patanjali who wrote 'Yoga Sutra', two thousand Years ago. He described the principles of the full eight fold yogic discipline. He composed the treatise in brief code words known as 'Sutras'. 'Yoga Sutra' is the most important basic text on Yoga. It is through this basic treatise that the essential message of yoga spread throughout the world. Aim of Yoga is the attainment of the physical, mental and spiritual health. Patanjali has recommended eight stages of Yoga discipline. They are
Yamas- Yamas (abstentions or restrains)

Niyamas- Niyamas (observances)-austerities, purity, contentment, study, surrender of the ego
Asanas- Physical postures or exercises
Pranayama- Control of vital energy (Breathing control)
Partyahara- Withdrawal of the senses
Dharana- Concentration of the mind (Contemplation)
Dhyana- Meditation
Samadhi- Attainment of The super conscious state