It helps to widen your stance. This brings your knees and thighs outwards to make room for your stomach. As for being back heavy, squat shoes are commonly used

It helps to widen your stance. This brings your knees and thighs outwards to make room for your stomach. As for being back heavy, squat shoes are commonly used in weightlifting and they have an incline built into them. If you don't want to buy squat shoes you can always put a block of wood or something that's about an inch or so under the back of your foot to give you an incline. This helps you get deeper.