Players form 2 stacks. Beginnig on the left side player passes disc to the center and immediately run across the field and waits for swing pass.
When first player from left stack receives a swing pass, first player from central stack is again forced to start movement toward a side line as fast as possible after his throw.
And now the same position like on the begining, but from other side, Only difference is that these players never stop, either slow down.
Players changes backhand to forhand and back, according to the side they are moving from.
When first pair of players shifted off a bit, next pair can start and follow the same steps.
And so on, until the end of playing field (indoor field of course but there are no reason not doing it outdoor)