Position your feet hip-width apart, toes pointed straight ahead and a barbell in front of you. Squat down, maintaining a neutral spine with your abs drawn in. Grab the bar just either side of your knees with an overhand grip.

Lift the bar from the floor by pressing through your feet, with slightly more pressure in the heels. The knees and hips should extend together while you keep the bar close. Once you reach a standing position, lower the bar back to the starting position by bending your knees and descending the same way you came up. Repeat. Don't touch the bar to the floor before beginning the next rep.