Wearing those rear-view mirror glasses, a right handed player would backhand the ball coming to their right and reach around and forehand the ball coming to their left.

Even pro tennis players could enjoy learning the game from scratch all over again. Might not be a bad drill to help your regular game too.

Cheap equipment as well, a couple of twenty dollar rear view mirror glasses and you're ready to play assuming you've already got the other stuff.
-- doctorremulac3, Oct 27 2018

Inspired by... Mirror_20framed_20r...20see_20behind_20me
Mirrored tennis racket so you can see the player behind you. [doctorremulac3, Oct 27 2018]

Here's some for 3 bucks each. https://www.partypa...EAQYASABEgJWIvD_BwE
[doctorremulac3, Oct 27 2018]

random, halfbakery