No way am I putting a picture of a snake on my blog!
Sidewinder is a simple concept to help your players work on cross court shots. Players play out points cross court only. One point awarded after each rally UNLESS one player is forced to step into the alley, in which case the other player gets 5 points. If playing doubles, the 5 points is awarded if any player steps outside the court boundary. You can play to a specific point total or use it as a timed event.
Remember, even if the ball is returned in, if a player had to step outside the boundaries to hit it, point is over and awarded to opponent.