Pitching from the full windup
Small steps: Take a small step back and make a small turn to place your pivot foot parallel with rubber.
Lift leg into balance position, toe pointing down: Take your time. You don’t need to rush, and you shouldn’t swing your leg into the balance position. The balance point for pitchers is about waist high, and the hands should stay close to body, preferably over back leg.
Hands remain still, head remains still.
Glide through the catcher: Once balanced in the balance position, stay back and glide outward, directly towards the catcher. Use gravity. Toes to the target.
Arm mechanics - quick hands: The quicker the break of the hands, the faster one throws.
Throwing-hand outside elbow with elbow shoulder height: Bring glove-hand away from body and pull directly back into chest. Fingers on top of baseball on release. Continue throwing motion by swinging throwing elbow past opposite knee.
Throw down hill: Whip the throwing arm across the body from 11 o’clock to 5 o’clock (outside the opposite knee). Get into good fielding position by squaring up to hitter on follow-through. Stay balanced on balls of both feet to react to ball
Pitching from the stretch windup
Stay tall: Don’t bend back leg.
Feet shoulder-width apart in set position: Too close and the pitcher loses balance; too far, and the pitcher can’t pickoff to bases to keep runners close.
Quick to the plate: Deliver the baseball in 1.3 seconds or less to give your catcher a chance to throw out potential base runners.
One motion all the time: Knee-to-knee. Never slide-step because too much stress on arm and loss of velocity.
Found these on this site a couple of minutes ago, and I can’t disagree with anything said, it all makes perfect sense, this should take care of some of the questions floating around on what good mechanics are made of.