Holding either end of a long resistance band, step on to the middle. Place your feet shoulder width apart with your toes pointing forward. Brace your core, keep your chest up and keep a neutral spine. Shoulders and traps should stay relaxed with your arms fully extended by your sides. Bend your knees slightly and drive your hips back but don't allow them to go lower than your knees. Be sure to keep your chest lifted. This is the start position. Imagine then pushing the ground away from you with your feet and as you do so driving your hips forward and extending at the knees. All the while exhaling as you do so. Pause at the top when you've reach full hip extension and are standing tall. Then return to the start position, inhaling as you do so.