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You are seriously going to feel the burn in your legs after this one (if you're short on time, we'll…
We thought a "flutter kick" sounded like it'd be easy. We were wrong.
Watch this video to see why they call it the world's toughest workout.
How to get your core ripped (warning: involves actually exercising).
You'd think something called an "air squat" would be gentle, but you'd be very, very wrong.
This man can do 300 burpees. That's 299.5 more than us.
Get into shape by kicking your own ass! Not literally. That just works the toes.