[chipingguru]

Seems to me the tucking under of the hips would limit the hula hula hip action and clearing the right hip. Might lead to a sway down the target line and a big steer if not carefully monitored.

Proper hip action does no lead to a bad back but can be used to pull the body into a straight up alighnmant without added stress to the spine. If anything it aleviates stress on the spine.