VR with a twist
Suppose you are playing a game of boxing in VR. You get an uppercut and it is as if you are really being hit. Your head twists up forcibly. You can do that if you combine VR with electrodes on your neck muscles. These stimulate certain points that make your head spin. Up, down, left or right.
Also useful if you MUST see something during a VR game or training. Then, for example, you can’t walk past the fire extinguisher you need to put out that virtual fire.