Two of my absolute favorites. For me, these two things are what contributed to making me the size that I am.
There are so many ways to do both of them too. I like to superset my pull-ups with push-ups. I do 10 pull-ups, rest a little, 25 push-ups with my elbows tucked in to my sides, 10 more pull-ups, etc. Then I start putting my hands out a little wider and flaring my elbows out on both exercises. With the push-ups I start pinching my shoulder blades back to hit my chest more.
Anyway, I just thought I'd post something, because I really think these two simple things are very underrated. I get the best pump ever from doing this.
Some high-twitch muscle freaks might not feel the same about this... but that's cool. Whatever works for you. This is what helped me out a lot.