Physical Parameters Causing Slide and How to Diagnose Them:
In order to coil around your lead hip during the downswing several physical characteristics must be developed. First and foremost, lead hip internal rotation is paramount for full rotation into the lead hip without any lateral sway. If the body is unable to rotate around the lead hip due to joint or muscular restrictions than lateral movements will dominate the pattern. Secondly, the ability to separate your upper body from your lower body allows the lower body to laterally stabilize while rotating your shoulders through a full finish. Limited trunk to pelvis separation is usually caused by reduced spinal mobility and shortened lat flexibility. Finally, the ability to laterally stabilize your lead leg during the downswing is directly proportional to the strength and stability of your gluteal musculature (your butt). When it comes to lower body lateral stabilization the glute medius is the king. This muscle helps prevent the lead hip from elevating and shifting lateral during an aggressive downswing rotation.