Raise the pulse and prime the first touch with passing and movement in a triangle. Keep the pace easy, move after every pass, and receive across the body to keep it flowing.
Three players on a triangle about 10 to 12 yards a side, one ball. Pass around the triangle and move to a new angle after each pass. Keep the pace easy and the touch soft. Build from two touches to one, and add a second ball once it flows.
Warm-ups have one job, and it is not technical improvement. Raising the pulse, moving the joints through range, and getting a hundred unhurried touches on the ball before anything demanding starts is the entire purpose. Coaches who treat the opening exercise as coachable technical work tend to stop it repeatedly to correct things, which defeats the point twice over: players cool down, and the corrections land badly because nobody is warm enough to execute them yet.
So the standard here is deliberately lower than in the other passing drills. Easy pace, soft touches, heads up, keep it moving. If a player's weight of pass is poor at this stage, note it and address it in the technical block twenty minutes later when the body is ready and the group expects to be coached.
Three players and a triangle is the right size because nobody waits. With four or more in a shape this small there is standing around, and standing around in the first ten minutes of a session is how players arrive at the main exercise cold.
The one habit worth insisting on even here is moving after every pass. It costs nothing, it keeps the pulse up, and it means the warm-up is rehearsing the behaviour every later exercise depends on rather than teaching players that passing happens from a standing start.
Progress it gently by adding a second ball or shrinking the triangle rather than by demanding one touch.
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.