Is this really necessary?

MSN - T-Shirt Turns Air Guitar Into Music
Scientists announced Monday that they have developed a high-tech T-shirt that turns the strumming of an air guitar into music.

The T-shirt has motion sensors built into its elbows that pick up the wearer's arm motions and relay them wirelessly to a computer which interprets them as guitar rifts. . .

And this will be good for what? one might ask. Well, they have a plan
Helmer said sensors could be used in the future to reproduce a person in the virtual world so they could get feedback on their actions and improve their sporting techniques.
Unbelievable.