I'm having trouble getting into the habit of doing a full unit turn on my FH and using rotation to hit the ball. I tend to rush a partial unit turn at best and arm it. It's almost like my body doesn't know how to use rotation to hit the ball nor how much time is needed to set it up (i.e. do the unit turn). I know medicine ball training is good for core strength, but I'm wondering, could shadowing the stroke with a medicine ball also help me develop the muscle memory and timing I need to hit a solid FH? I figure that, because you hold the ball with both hands, to get it back you have to turn both your shoulders, i.e. make a full unit turn, and because it's moderately heavy, you naturally load up your outside foot. Similarly on the forward swing, providing you extend the ball towards an imaginary target, or throw it at a wall, again, because both hands are on the ball, you can't over-rotate, i.e. your weight will go in the direction of the shot, not off to the side (as it often does for me). Surely it's got to help?