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 ...

(a) Ready for this one? Stand with your feet shoulder-width apart and sink down into a squat – your feet should be flat on the floor, bum out and knees behind your toes. (b) From this position, jump ...

No matter where you are or how much time you have, you can get in an amazing leg workout. You don't even need equipment or machines; rather, your body becomes the machine when you use these bodyweight ...

Classic exercises are classic for a reason. They’re effective, and usually incredibly versatile, lending themselves to loads of fresh, challenging variations. The updated moves—squat jacks and chair ...