Hot yoga is having a hot moment in Hollywood! Whenever celebrities reveal the secrets to their beach bodies, it seems that the vigorous group class is often at the top of the list. Hailey Bieber, Jordin Sparks and Queer Eye’s Antoni Porowski have all told Us Weekly they do the stretch sessions as a regular part of their fitness regimens — and there are plenty more stars in the same wellness boat. There are various forms of hot yoga — most notably Bikram yoga — but they all have one thing in common: a heated room. In a hot yoga class, the temperature is usually brought up to over 100 degrees Fahrenheit. Some of the benefits: Higher temperatures encourage deeper stretching, more flexibility and plenty of sweat. “I like hot yoga, because obviously it feels great to sweat,” Jennifer Aniston and Kate Beckinsale’s yoga guru Mandy Ingber has told Us Weekly. She warns it’s not for everyone, including people who are pregnant or have heart problems, but the sweating aspect is ideal. “That’s actually a tip. Sweat five times a week,” she added. “If it’s not through exercise, then definitely a sauna or something, but definitely sweating is important. For that, hot yoga is amazing. I think it...