The practice of Yoga is believed to have started with the very dawn of civilization. The science of yoga has its origin thousands of years ago, long before the first religions or belief systems were born. In the yogic lore, Shiva is seen as the first yogi or Adiyogi, and the first Guru or Adi Guru. Yoga works on the level of one’s body, mind, emotion and energy. This has given rise to four broad classifications of Yoga: karma yoga, where we utilize the body; bhakti yoga, where we utilize the emotions; gyana yoga, where we utilize the mind and intelect; and kriya yoga, where we utilize the energy.