Work Out Colder
This fitness trend targets body fat in a new way
At Brrrn studio in New York City, exercisers go for goose bumps, rather than dripping sweat, in superchilled 45- to 60-degree classes. There’s a good reason the room feels a bit like a meat locker, says cofounder Johnny Adamic: “Cooler temps have a real impact on your body fat.” At just below 65 degrees, the body begins to turn regular fat into calorie-burning “brown” fat, says Philip Kern, M.D., of the University of Kentucky. His research found that subjects had more than double the brown-fat proteins in winter than in summer. It ’s unclear how long the bigger burn lasts after a chilly blast, but prolonged cold exposure helps activate brown fat more frequently over time, Dr. Kern says. If you can’t get to Brrrn, just set the AC to sub-60 to compensate for the extra body heat you generate exercising, or head outside when the temp drops.