Hot yoga, as well as Bikram Yoga, requires strict control over the temperature and humidity of the environment as it’s designed to mimic the climate of India. Typically, a hot yoga studio needs to be maintained at a temperature of 35°C to 40°C, with a relative humidity (rh) of at least 40%. The humidity level is particularly important, because at 40%rh perspiration won’t evaporate as quickly which prevents the body from being cooled. This increases the amount of healthy sweating, makes stretching more effective and helps to prevent injuries.