I am not a huge proponent of rotation for everyone, there are many handicapped golfers and golfers in general that don’t have much rotation in their swings. I think the term rotation should be replaced with separation for those trying to use more lower body. It’s my belief that most of the speed in the swing comes from your hands and your arms and not from your hips. So for those working on this, your shoulders should turn your hips on the back swing and your hips turn your shoulders on the down swing. Create separation on the back swing and keep the separation on the down swing. Most people that I teach try to overturn both on the back swing and on the down swing and follow and miss the important part of unhinging and rotating your hands through the golf ball at impact.