PREVIOUS QUESTION: Pushup form
'Sup Lance.
I've started doing 7 Weeks to 100 Pushups and 7 Weeks to 50 Pullups for my upper body.
To make the former program harder I do my pushups weighted with 45 lbs. on my back, but I don't really know what proper form is besides being shoulder width and... y'know, pushing. I know with pullups you focus on your elbows doing the pulling (which helped a lot, by the way); is there something similar for pushups?
The reason I ask is because I experience shoulder pain now and then, and I can only guess that I'm doing them wrong sometimes.