I would highly suggest stretching before going to use one of these interfaces, wouldn't want to pull something.
Many present applications seem to be developed or extended from the existing physical use.
If this is a deliberate approach to provide exercise or play scenario for the user then it just fits into it. (Kinect - games)
But for the new area, they should have the feeling of yesterday. They should look so effortless & magical. (Apple - zoom)
That will be a sweet spot of acceptance.
A function which is presently performed by finger movement ..not going to replace by hand movement.