The easiest cue for this is “Fast Feet”. At first this might feel confusing because fast feet does not necessarily mean fast running. Remember, good form should work regardless of speed.
Think of it like this: if you can jog in place, you can jog while moving, right?
Same applies to “Fast Feet”.
If you’re used to over striding - in order to maintain the same pace with smaller steps, you need to take more steps in the same amount of time.
AKA faster feet.