Adding banded tension to your shoulder work is guaranteed to trigger new hypertrophy gains. Just grab a couple of resistance bands and wedge them under the bench for overhead dumbbell presses.
The key is to lift the dumbbells all the way up to the top and hold them there for a couple of seconds in the contracted position of each rep.
Combos consist of big-money lifts done in rapid succession. Do them right and you'll muscle up quick, along with building speed and power. Oh yeah, you'll also drop some blubber... assuming your heart doesn't explode.