Originally Posted by
Mark Rippetoe
The push press involves the knees and hips generating the initial force off the shoulders, and the Olympic press uses the quads to lock the knees so that hip and torso movement generate the additional upward force. The Olympic press adds a second hip action as the bar slows above the head. You are free to follow the advice in the book and ignore the Olympic press material, which is of interest to some of us.
BTW, I PRed the Olympic press last night, 203.5, first real PR in years. It's not much, but it's mine.