First things first: Oxygen Yoga & Fitness's far infrared yoga classes are warm. The studio's innovative heating system boosts the temperature to a beach-like balminess without the sweltering oppressiveness found in many hot yoga studios. However, this heat does more than just encourage a little sweat. It warms the tissues, quickening circulation as the heart rate increases. It also works in concert with yoga's slow, intense stretches to loosen muscles and increase flexibility.