Weight a pass into the runner's path. Time the release to the run, play into the space ahead, and let the runner take it in stride and play forward without breaking stride.
The passer plays into the space ahead of a runner, who takes it in stride and plays forward to a target. Emphasise the weight of the pass into the path and the timing of the release to the run. Vary the angle and speed of the run. Play both directions and rotate the roles.
Weight is the only quality of a pass that depends on somebody else. Accuracy and technique belong entirely to the passer, but a ball played into space is correctly weighted only in relation to how fast a particular teammate is running, which makes it the one passing skill that cannot be practised in isolation from the person receiving it.
That reframing is worth giving to players, because it changes who is responsible when it goes wrong. A pass that a quick striker would have reached is an overhit pass to a slower one. The passer has to know his runner, and the pair have to build the relationship through repetition rather than through instruction.
Into the path rather than to the feet is the instruction, and the reason is that a pass to the feet stops a runner who was travelling. All the advantage generated by the run is discarded in the moment he has to check, and a defender who was beaten is level again.
Timing the release is the part that separates this from a straightforward pass. Too early and the runner is still marked and possibly offside. Too late and the covering defender has adjusted and the space has closed. The cue is the runner's first two strides, not the moment he calls.
The honest note is that this pass is the most common source of frustration between teammates in youth football, because both players blame the other. Saying out loud that the responsibility is shared, and coaching them as a pair, defuses more arguments than any technical correction.
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.