Yoga is a group of physical poses (asanas), Manas Shanti (mental peace), spiritual practices, Shisthu (discipline), which originated in Bharatha (ancient India), more precisely during the Indus-Sarasvati civilization in India over 5,000 years ago. Some researchers think that yoga may be up to 10,000 years old, from the very dawn of civilization. It is one of the six Astika schools of Hindu philosophical traditions and it is mentioned in the ancient Vedic texts. The word yoga was first mentioned in the oldest sacred Rigveda and also in the Upanishads. The Upanishads took the idea of ritual sacrifice from the Vedas and internalized it, teaching the sacrifice of the ego through self-knowledge, action (karma yoga) and wisdom (jnana yoga). In the yogic lore, Shiva is seen as the first yogi or Adiyogi, and the first Guru or Adi Guru”.