The ball starts with RW, who makes a long pass to the opposite LB and starts running over.
LB makes a piston movement and passes to LW, who has started a running in.
RW continues running in to LW's position.
LW passes to RB, who makes a piston movement and passes to the next RW.
RW makes a long pass.... and so on.
The last running wing must always run outside the first running wing.
Remember to train both ways.