This push up is by far my favorite one. I learned it from a guy that really helped me when I first started training, I learned a lot from him. This push up instead of the static up and down adds a clockwise or counter clock wise rotation to the mix. This, as far as I can tell, works out the shoulders more and I'm going to guess helps your shoulder joints. It also works your forearm a little. Read on for the tutorial on how to do them.