Often, you hear people talking about a "late launch" when pitching mechanics is discussed. A late launch allows a pitcher to get the maximum amount of velocity behind every pitch. If done properly, it also allows a pitcher to throw hard without undue wear and tear on their arm.
In an article on DriveLine.com last year, Kyle Body went into great detail about the mechanics involved in the late launch. The article includes no less than five videos, illustrating the late launch as well as a detailed explanation of how the various body parts contribute to an ideal late launch.
Kyle applies principles of physics and explains the ideal late launch as being part of a kinetic chain. He even manages to work in a mention of the Pythagorean Theorum. In essence, your hips have already rotated and your plant foot is down before the mid/upper section has begun to rotate. As the mid section begins to uncoil, the arm follows.
Definitely give Kyle's article a read and check out the videos. Make sure you watch the video of David Robertson frame-by-frame as Kyle suggests. Robertson is the epitome of the late launch technique.
The title of the article, "A Biomechanical Understanding of the Late Launch (Wolforth Tenet)," is a mouthful. You can access it by clicking here.
Pitching Machine Stop Quote of the Day:"Your body is not made to throw like we throw. That's why you see softball pitchers pitching two or three games a day. It's a natural movement in softball. In baseball it's not a natural movement." - Jamie Moyer