Technically speaking, hot yoga has been around for centuries. In India, asana practice has been around for ages; it has been a mainstay long before our air-conditioned times.
About Us — Hot Yoga on 17th
Yoga: Methods, types, philosophy, and risks
Benefits of Hot Yoga: Is It Really Worth All That Sweat? - CNET
Bikram Yoga: What Is It and What Are the Benefits? –
Yoga Classes - Panther Gym
6 Things I Learned from Hot Yoga
13 Best Yoga Stretches to Do Every Day - Yoga for Beginners
Is Hot Yoga Better for You Than Regular? Science Suggests Not
The heat of hot yoga can be very good — but also risky for some people - The Washington Post
What is Hot Yoga? Hot Yoga Benefits & More
15 Benefits of Hot Yoga Backed By Science - Body Alive Fitness
Is hot yoga good for you? Exploring the science behind the sweat