What is Hot Yoga

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Hot yoga refers to yoga exercises performed under hot and humid conditions. Often associated with the style devised by Bikram Choudhury, hot yoga is now used to describe any number of yoga styles that use heat to increase an individual's flexibility in the poses. In colder climates, hot yoga often seeks to replicate the heat and humidity of India where yoga originated. Some forms of hot yoga include:

Bikram Yoga, a style synthesised by Bikram Choudhury from traditional hatha yoga techniques, practised in a room heated to 40 °C (104 °F) and 40% humidity.
Forrest Yoga combines yoga asana with Native American spirituality to create a "yoga sweat lodge" in a heated room.
Power Yoga is derived from Ashtanga Vinyasa Yoga and uses heat to replicate environmental conditions in Mysore.
TriBalance Yoga another form of hot yoga, performed in slightly warmer but less humid conditions than Bikram Yoga.

Source: Wikipedia