18 Great Cardio Workouts That Don't Require Running

This isn't the best form of cardio for someone just starting out — it's way too easy to get sloppy and have bad form — but if you're already pretty fit, burpees will get your heart rate up in no time. "These use absolutely everything," says Corkill. "That's why they're so efficient—they tax a lot of muscles at once, especially if you add a push-up at the bottom."