LJ was here

“Note for Coaches: Try this possession exercise. It’s called 31 and it’s my favorite because it incorporates so many aspects of possession, including when to play one-touch and when to take two or more touches. It’s a tough one to keep track of, so if you have some helpers or injured players available (preferably 3), call them into service and assign a team to each one of them. Divide your group into three teams of four and use a grid about 30 x 20 yards. Adjust the size of the grid as necessary. One team is yellow, another is blue, and the third team is red. To start, red and blue play keep-away from yellow. If the blue team, for example, gives the ball away or knocks it out of bounds, the red and yellow immediately play keep-away from blue. There is no touch restriction, but whenever a player on either of the two attacking teams successfully passes the ball to any other attacking player with one touch, both attacking teams are credited with a point. To clarify, two teams get credit for every point that is scored. The object of the game is to be the first team to score 31 points.”
― Dan Blank, Soccer iQ: Things That Smart Players Do