Pull-Up Dip Workout, I wanted to give it a try. But I don't have a dip bar here and I have no plans to get one as I don't have the space.
The reason that the motion of using a dip bar is important is that it develops your lower pecs, which a regular flat bench press can't do. And the reason that you want to exercise your lower pecs is that there are three attachments from your shoulder to your chest - upper, middle, and lower. The upper chest is developed by doing incline presses, the middle chest is developed by doing flat bench presses. And the lower chest is developed by doing dips - or something similar - here is what I suggest:
Now go do 100 of them!