Yoga (Sanskrit: योग) is a commonly known generic term for the physical, mental, and spiritual practices or disciplines which originated in ancient India with a view to attain a state of permanent peace. Specifically, yoga is one of the six āstika ("orthodox") schools of Hindu philosophy. One of the most detailed and thorough expositions on the subject is the Yoga Sūtras of Patañjali, which defines yoga as "the stilling of the changing states of the mind" (Sanskrit: योग: चित्त-वृत्ति निरोध:). Yoga has also been popularly defined as "union with the divine" in other contexts and traditions. Various traditions of yoga are found in Buddhism, Hinduism, Jainism and Sikhism.
Bikram Yoga is a system of yoga that Bikram Choudhury synthesized from traditional hatha yoga techniques and popularized beginning in the early 1970s. Bikram Yoga sessions run for exactly 90 minutes and consist of a set series of 26 postures and 2 breathing exercises Bikram Yoga is ideally practiced in a room heated to 105°F (≈ 40.6°C) with a humidity of 40%, and is the most popular form of hot yoga (a series of yoga poses done in a heated room).
Bellur Krishnamachar Sundararaja Iyengar, (known as B. K. S. Iyengar) (born December 14, 1918, in Bellur, Kolar District, Karnataka, India) is the founder of Iyengar Yoga. He is considered one of the foremost yoga teachers in the world and has been practicing and teaching yoga for more than 75 years. He has written many books on yoga practice and philosophy, and is best known for his books Light on Yoga, Light on Pranayama, and Light on the Yoga Sutras of Patanjali. Iyengar yoga classes are offered throughout the world, and it is believed that millions of students practice Iyengar Yoga.