I was at a camp site and saw Czechs playing a strange game that looked like a cross between soccer, volleyball, and tennis. What is it?

This sport is called nohejbal which literally means football (noha = foot), but is translated as football tennis. It was developed in Czechoslovakia in the 1920s and 30s and is played on a volleyball-sized court with the net set at tennis height. The rules are similar to volleyball, except that the hands and arms are the only parts of the body which cannot touch the ball. Teams consist of two or three players and points are usually concluded with the equivalent of a smash – the leg raised high and brought down over the ball. The game is quite popular among Czechs and they like to claim that they are the world’s best (partially a consequence of being one of the few countries who play it)..