Hip/waist importance in the unit turn when hitting groundstrokes.

The waist or hips are not sufficiently emphasized when turning the body to hit groundstrokes. There is too much emphasis on the shoulder turn. I strongly recommend getting the waist or hips turned 90° to centre before stepping into the ball. Then when one does step in to hit the ball there will be additional hip and waist turn due the unit turn when swinging. If one is hitting a semi open or open stance then focus on turning the hips and shoulders when loading the legs during the swing. afdd