On LetsTalkPitching.com, they recently had some discussion around baseball pitching drills to help promote proper pitching mechanics of leading with the hip to generate momentum. Here's a pitching drill called the Hershiser Drill that helps teach leading with the front hip and keep head and shoulders slightly behind the front hip.
You stand sideways to a padded wall or chain link fence with your glove side shoulder facing the wall/fence. Then you lift your knee and push your hip or back pocket into the wall. The hip or back pocket should be the first and only part of your body to touch the wall/fence. You can reverse rotate the shoulders as if you're "showing your number" to help. Start with your pivot foot about one shoe length from the wall/fence. Then progress to the pivot foot being two shoe lengths from the wall/fence. Wear a glove. And practice pushing the hip early - before peak of knee lift or even right after the stride foot lifts off the ground.