Strong, with well-developed brush hand can easily cope with the physical work, and with a hockey stick, tennis racket, paddle.
In the sporting goods stores sell special wrist bands: rubber “bagels”, spring and even air. But they are either “bland”, or only work for compression, and moreover, are not designed for the load change.
That’s why I made the expander, which has additional capabilities. And main from them — a gradual increase of the load by increasing number of springs.