Limited head movement in the golf swing is an important element because it produces better impact and speed. Jack Nicklaus’ coach, Jack Grout, used to grab a clump of his hair and hold his head still and hit golf balls. Well, that hurts and some golfers have so much head movement that I would likely pull out a clump hair completely. So I use a bicycle helmet. The helmet has slits that I can hold on to. After I have held them there for a few shots I will let them do it on their own. With the helmet on, they can feel and focus on the head movement and keep it to a minimum.