Where: UK Wallball
Wallball could be one of the simplest ball games you can play, as you all you need is a flat wall, a ball and some pals. All you need to do is hit the ball against the wall without bouncing it, and after it rebounds on the floor your opponent needs to hit it back.
A point is given to whoever serves the ball after their opponent misses it. Now London's first dedicated wallball court has opened near the Shard in south London, the brainchild of an NHS doctor who sees it as a fun way to encourage people to exercise.
His aim is to get schools and councils to find walls for people to play for free, and given the non-contact aspect of the game we could soon be seeing wallballs popping up everywhere.