For information on our approach and mentality at the mound, check out the Mental and Situational Guide.
Every time you toe the rubber, be focused on the very next pitch. You cannot be worried about anything in the past (umpire's bad call, shortstop's error, etc.) or what might happen in the future. You are focused on the present: this one pitch and one pitch only. Do not step on the mound until you are completely ready. Complete and total focus.
When throwing from the windup, take a small rocker step back, then pivot your foot down into the pitching rubber. Your center of gravity should not leave the mound. The less movement at the beginning of your windup the better.
From the stretch, if you slide step, have a small weight transfer to your back leg, either by rocking back slightly or going knee to knee.
From the windup or the stretch, no matter how high you lift your leg, do not let your body drift forward. Balance is the way we load to get the most out of our legs and to sync the timing between our arm and body. It is the most important physical part of your mechanics. It is what allows you to get the most out of your body and produce perfect timing with your arm to generate a good release point. There should be a very slight pause when you hit your balance point.
The hands should start to separate a split second before the legs begin to drive towards home plate. This allows a long arm action and gets the release point out in front. When your hands break, the ball should travel down and then back and then up (to an L) in the shape of a semicircle with the ball facing 2nd base. Your lead arm gets extended as well because you are going to tuck back with it when you throw.
Always step straight towards your target. There should be a straight line connecting your toes. The ball is likely to go the direction that you step. If your stride is too closed, you will have a hard time getting your hips through.
When the stride foot lands, you should be in the power position with your feet in line with the target and your weight slightly back. Ideally, there should be a straight line from your back elbow, through your shoulders, and out your front elbow pointing directly at your target.
Use your legs to drive directly to your target. Get your release point as far out in front of your body as possible. You want to cut down the distance from your hand to the catcher's mitt. When you let go of the ball, your chest should be out in front of your lead knee. Finish forward (toward your target) and finish low (follow through). You should finish in a good fielding position.