Air Squat Stand with your feet slightly wider than your shoulders, feet parallel or toes slightly turned out. Bend your knees, lowering your hips deeply. Bring your thighs parallel to the floor and bend the elbows, keeping weight back in your heels. Rise back up, straightening the legs completely, squeezing the glutes at the top of the movement to get the most out of the exercise. This counts as one rep. Continue your reps at your own pace for 60 seconds. Take a 15-second break, then speed it up and move as quickly as you can for 45 seconds. Image Source: POPSUGAR Photography / Kyle Hartman