I was reading some of Chris O'Leary's mechanical analysis's of pitchers, and I was interested in a thing that Kerry Wood and Koufax do. These two pitchers, both very hard throwers, stiffen up, and almost push back towards second base with their landing leg as they rotate their shoulders. Chris is of the believe that doing this allows the hips to rotate more, giving them their exceptional velocity. But he also thinks that doing this makes the shoulder take the majority of the stress upon release, opposed to someone like Seaver who's front leg is bent and acts as a spring, allowing some energy to dissipate into the ground. What do you guys think about this? Here are some pictures of guys who do it and guys who don't.
Guys who do-
Guys who don't-
http://graphics.boston.com/images/bostondirtdogs//Headline_Archives/RCbos_RChou.jpg (Clemens, who I noticed incidentilly is doing more of the stiff leg thing now, check out the pics in the article about him in SI)