Stand 4-6 inches in front of a knee-high bench.Grab the end of one dumbbell using both hands and place it vertically in front of your chest, elbows facing down.Keep your back slightly arched as you push your hips back, bend your knees, and go into the squat position.Squat back onto the bench and hold.Keeping your heels pressed into the ground, return to the standing position.Perform as many reps as you can for 30 seconds.Rest for 30 seconds.