“When you have that heat going, you’re sweating a ton,” says Jessica Lustig, owner of The Hot Yoga Spot. “People look like they just went swimming. They’re dripping sweat.” Doing yoga in a warm room makes good sense, Lustig says. It’s easier and safer to stretch the body when it’s warm and it enables people to get deeper into the poses. Heat also raises the heart rate, which increases the cardiovascular benefits of the exercise. But no matter how you exercise, Lustig says, “everybody equates sweating with a good workout..