Coined by Homer Kelley in his book The Golfing Machine, he details that "Hinge Actions" describe and control the manipulation of the hands through the impact interval. Here's a look at the difference in trajectory between angled hinge action (left), which is the clubface simultaneously closing & laying back, producing a higher flight than the horizontal hinge action (right), which is clubface closing only.
![](https://s2.save4k.ru/pic/RFZ5qNfVC4g/maxresdefault.jpg)