This video is taken from a Miami Beach trainer's instructional DVD where he shows how to do a bunch of basic exercises.
The short video shows how to perform a classic push-up and how to do an easier version of it.
Everyone knows how to do a push-up. However, there is an art to doing it well--you want the right muscles to be doing the work. Get some gain for your pain!
It is well-suited for people who have not done much exercise since taking a gym class, but it might be worth 5 minutes of your time if you have read this far.