To do Lean Backs, start kneeling on the ground with your knees about hip-width apart. Flex your feet and kneel nice and tall. Squeeze your glutes and brace your abs. You can then cross your hands over your chest or reach them out in front of you. Engaging your core and driving down through the balls of your flexed feet, lean back. Do not arch your back as you lean back but simply move from your knees. Go back as far as you can with your body in a nice straight line. Then come back forward. Squeeze your glutes and brace your abs the entire time. Feel your quads really working to control your lean back. Do not sit back on your heels as you go back. Come back up to kneeling nice and tall and repeat. You can make this move more challenging by holding a weight in at your chest or even in your straight arms out in front of you. Do not rush the Lean Back, but instead move in a slow and controlled fashion.