Keep a whole group moving and touching the ball: two balls in the square on one rhythm, every pass met outside the cone and followed to the back of the next line.
Mark a square of four cones 15 metres a side and put two players at every cone, one behind the other, just outside it. A ball starts at one cone and at the cone opposite. Both balls go on the same beat: the front player passes along the side to the next cone and follows his pass to the back of that line. The front player there meets the ball just outside his cone, takes his first touch round the outside of it and plays on with his second, and the player behind him steps up. Both balls go round together, always on opposite sides of the square. Go one way for a few minutes, then reverse.
The Ajax passing square is the pass and follow warm-up scaled up for a whole group: eight players, two at every cone, and two balls going round at once. With one ball and eight players most of them stand still. With two, played on the same beat from opposite cones, everyone is passing, receiving or following almost all the time.
The rhythm is the drill. Both balls are played at the same moment and arrive at the same moment, always on opposite sides of the square, so the two never meet. If one pair rushes or dawdles, two balls end up heading for one cone and the square jams. Call the beat out loud at first if you need to.
Every receiver is waiting at his cone when the ball arrives, never still on the move. He meets it just outside the cone, takes the first touch round the outside of it and passes on with his second, and the man behind him steps up to the front. The passer follows his pass outside the line of the ball and joins the back of the next line, which keeps two at every cone all the way round.
Start it at walking pace with one ball if the group is new to it, then add the second. Go one way for a few minutes, then reverse so the other foot does the receiving.
Save it to your private drills, then change the animation, adjust positions, swap equipment, or drop it into a session block. Or start from a blank pitch and build your own.