Whether you love (or hate) the classic burpee, you can't argue that it's a great cardio move that works every muscle. Here's a playful variation to try that targets the core big time — it's so fun your abs won't even realize they're getting majorly ripped. And because it's still a burpee, your legs and butt will get an equally good workout.
Start off rolling through 10 in a row, or if you're ready to step it up, try this challenge: see how many reverse burpees you can do safely and effectively in one minute.