Call the fire department-this squat variation is about to set everything ablaze. Squats will always light up your glutes and quads. But the cardio king of the squat family-the squat jack-does so much ...

But no one wants to spend more time revving that heart rate than they have to, so you want to make sure you’re opting for the move that will hit you hardest. Mountain climbers may be classic, but it’s ...

Burpees are a popular exercise, but they can put a lot of stress on your joints. You can swap burpees for other lower-impact ...