Golf and tennis have a long history together. Those who play one sport often play the other; in fact, some teachers emphasize that the two strokes are pretty similar. For this drill, I'm going to use a tennis ball to help convey the importance of keeping a triangle formed between your shoulders, arms and hands. It's vital that these three body parts work in unison, as they encourage your larger shoulder muscles to do most of the work. Unfortunately, many golfers rely too much on the smaller hand muscles to make a putting stroke, and that only leads to jabs, stabs and even the yips. Place a tennis ball in just the right place, and you'll isolate the muscles that matter.
Place a tennis ball between your forearms so your shoulders, arms and hands can work as one.