Yoga is a physical, mental, and spiritual practice or discipline which originated in India. In Vedic Sanskrit, yoga (from the the root yuj) means “to add”, “to join”, “to unite”, or “to attach” in its most common literal sense.
Ashtanaga Yoga has eight limbs, those are :
Yama: moral way of living
Asana: movement of the body
Pranayama: breath observation
Pratyahara: mental preparation