Hot yoga isn’t just a nickname for Bikram-style yoga. It’s a literal description of the class. Bikram yoga occurs in a room that’s heated to a whopping 105 degrees controlled with 40 percent humidity. It’s a 90-minute class that circles through a series of 26 yoga poses. If you’re thinking anyone who would voluntarily sign up for that is crazy, you might be right. But despite the suffocating heat, it’s oddly invigorating. The purpose of the heat in Bikram yoga is to help warm up the muscles, allow for a deeper stretch, and help detoxify the body through the release of toxins in your sweat.