Lie with your back flat on an exercise mat and a barbell resting across your hips. Place your feet hip width apart and your toes slightly turned out. Grip the barbell firmly in each hand. Ensure the heels of your feet are as close to your glutes as possible and that your pelvis is tucked forward (ensuring you have no arch in your back whilst lying down). Focusing the tension in your glutes, drive your hips up to full hip extension, exhaling as you do so and making sure to keep your heels pressed firmly into the ground. Pause for a count of one when your hips reach full hip extension, keeping the tension in your glutes and then return with control to the start position, inhaling as you do so. Repeat.