This is brutal work even though light weights are used. It's a long complex, so pay attention!
The reverse grip dumbbell press is a great way to hit the upper chest. For all the dumbbell pressing exercises in this medley, focus on squeezing/flexing the chest. Don't just lift the weights. Contract the pecs to make the weight go up. At the top of each rep give the pecs an extra squeeze – squeeze in while trying to touch the ceiling.