There are several different types of yoga that use heat accentuate certain parts of the yogi's practice. Bikram Choudhury arguably started the trend in the United States when he brought his practice over in the 1970s. Interestingly, before he came to U.S. he was hailed the National Yoga Champion of Yoga for four years running in his home country of India before openning the College of Yoga. The Bikram style is differentiated from the others by the regimentation. True Bikram Yoga practice a 26 postures and two breathing exercises. The sequences focus on strength, flexibility, balance and proper alignment.
Ashtanga Vinyasa, sometimes called flow, power or just Vinyasa, often uses heat to replicate the weather found in the Mysores. Pattabhi Jois founded the practice, and greatly established it within the yogic landscape in 1948 when he founded the Ashtanga Yoga Research Institute. Vinyasa translates to the alignement of movement and breath. A key to Ashtanga is breathing. It serves as a means of focus for the practicioner and the resounence is reminiscent of ocean sounds.