Go step + the "32 reactive Mitts" combo 

The term 32 is a call to throw 3-2-3-2-1-1-2
The Go-step is a call, meaning go somewhere!
The punches need to be in a consistent tempo without breaks
throwing multiple punches with weights in hand helps build shoulder endurance.
It also trains the fighter not to be a one punch pony. You could miss the first 3 punches and land the 4th, 5th or 6th