Get a full group active and passing at two distinct ranges before a session. The long transfer wakes up the driven pass, the short cluster wakes up the touch, and the shallow strip means nobody is standing more than a few metres from the action.
Mark a strip about thirty seven metres long and eleven deep, with markers at the corners and midpoints. Spread ten players along it. Play one long transfer of ten to thirteen metres, then two or three short passes among the players where it arrives, then transfer it again in either direction. Keep the ball moving continuously and do not let a group of three keep it for long. Two touch, and change direction often.
The practical problem at the start of most sessions is not designing a clever exercise, it is getting fourteen players warm and touching a ball at the same time without splitting into groups that need separate supervision. Most warm-ups solve it badly, either by making half the squad wait or by spreading everyone so far apart that the passing is meaningless.
A long shallow strip solves it better than a square would. Thirty seven metres by eleven means ten players are never far from the ball, but the strip is long enough that a transfer is a genuine twelve metre pass rather than a token one. The shape does the organising, so a coach can stand at one end and see everything.
The alternation is what makes it worth doing rather than merely warm. A long driven transfer and a two metre roll are different techniques, and hitting both within a few seconds of each other is what a warm-up should be preparing. Groups left to themselves will settle on one distance within two minutes, usually the short one, because it is easier and feels sociable.
The failure to watch for is a cluster. With ten players and one ball it is very easy for three of them near the middle to keep it among themselves indefinitely while the other seven jog on the spot. The rule of two or three short passes and then move it on exists entirely to prevent that, and it needs enforcing early or the habit sets within the first few minutes.
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.