Breakdown your players stance and inward turn, into a four step process. Position the hitters in their stance and have them begin rocking back and forth between the catcher and the pitcher, lifting each heel off the ground in a rhythm. The four steps are rock towards the pitcher, rock towards the catcher, rock towards the pitcher, rock towards the catcher. The motion is not exaggerated but very slight. As the players rock back and forth call out 1, 2, 3, 4 to help develop a rhythm.