Yoga is an ancient physical and spiritual discipline and branch of philosophy that originated in India reportedly more than 5,000 years ago. The word yoga comes from the Sanskrit word yuj, which means to yoke, join, or unite. The Iyengar school of yoga defines yuj as the "joining or integrating of all aspects of the individual - body with mind and mind with soul - to achieve a happy, balanced and useful life." The ultimate aim of yoga, they claim, is to reach kaivalya (emancipation or ultimate freedom). Yoga uses asanas (postures), focused concentration on specific body parts, and pranayama (breathing techniques) to integrate the body with mind and mind with soul.