A juggling pattern, or rather set of juggling patterns. The simplest is a three ball cascade where every third throw goes over the top.

Other variations:

- One ball is thrown over the top from one hand to the other, but the next throw goes straight up then down into the same hand. Then the first ball is thrown back, to do the exact same thing in the opposite hand.

- The above, but both hands throw a self at the same time; i.e. it is a form of columns.

- The hardest version... Four ball tennis. One ball is thrown constantly over the others as above, but while you do a three ball cascade with the other three balls! The best way to learn this is to do a whole load of four ball over the top throws.

No matter which version you call 'tennis', they all have one thing in common: there is one ball which goes back and forth, and it is always the same ball. Because of this fact, this ball can literally be a tennis ball, it can be a large ball such as a football, it can be a club, egg, ring... etc. etc. etc. Experiment!