We asked Jason Tran, a popular New York City-based trainer and instructor at The Fhitting Room, Swerve Fitness, and Equinox, to create a heart-pounding, muscle-building 15-minute workout that you can do anywhere—no mats or weights required—whether you’re camping out in your childhood bedroom or a tiny hotel room. “This is a full body workout that can be done anywhere, using no equipment,” says Tran, which he demonstrates here, on the sidewalk. (Brrr.) “It’s also very efficient—it’s highly effective in burning calories, increasing your metabolism, and building strength and endurance,” he says. Get the full workout now at Well+Good!