Your legs play four different roles in your swing from address to finish as they provide balance throughout the swing, so the motion of the legs is critical to allowing you to progress through the swing correctly
Swing two clubs parallel to each other back and forth trying to keep the clubs from clanging together, this works your timing as well as coordinates your body with your arms
On the edge of the green when you encounter a nasty lie in deep rough do not try to help the ball up in the air, it is imperative that you strike the ball with a descending blow, playing the ball slightly back with your weight centered or slightly forward