There are few ways to get your heart rate up quickly (without moving far from the spot you start in) than jumping. Even jumping rope at a moderate pace—one at which you break a light sweat and can carry on a conversation, but your breath is quickened and you wouldn't be able to sing—will burn about 107 calories in 10 minutes; add in some fast-paced intervals to torch even more. And if you can't jump for 10 minutes straight, says Stehly, that's okay. "Go as hard as you can for 40 seconds and count how many jumps you can do, then rest for 20," she says. "Every minute, go again and try to top your previous count."