How it works: The original is Bikram yoga, a 90 minute series of 26 poses done twice in a 105-degree studio. You'll find other hot yoga classes - either Vinyasa or Ashtanga yoga, given in 90-degree-plus rooms. Proponents claim the high temperatures help boost metabolism.
Is it effective for fat loss (and is it safe)?
"You're going to sweat a ton, then you're going to drink like mad and put back on all the water weight you lost," says Dr. Peeke. As for claims you'll burn faster? "Your metabolism improves, at least temporarily, with pretty much any exercise." And the heat may make you move less vigoursly, notes B. Don Franks, PhD, a fellow of the American College of Sports Medicine: "The more work you do, the more calories you burn." Avoid hot yoga if you have hypertension or heart disease since it can spike blood pressure.
If you're focus and your goal is to burn fat, stick with power yoga for more effective fat burning. But if you test out hot yoga, drink up; Bikram masters recommend an extra 64 to 80 ounces of water per day.
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Source: Courtney Rubin