Virtual reality.

Grandson is spending part of his birthday in another world.

It is a remarkable experience. For a 12 year old it is games of course. You feel you are surrounded and in a fantasy land with sound and vision. You have to move around and wave your arms about so at least there is much more exercise than sitting in front of a tv screen.
For safety it works inside a six foot circle. As soon as you step outside you areback in our world so you cannot walk into a door.

They can be used for many things other than games. You can experience the new kitchen you might be thinking of buying. Disabled people can go for a country walk and look for flowers and birds.