Follow Your Throw
When making your throws, it is very important to follow your throws. This will allow you to not only be more accurate but also have less stress on your arm. If you automatically stop your throw once you let go, it creates a great amount of stress on your arm. My general rule is to follow your throw until the first baseman catches the ball, this will allow less stress on your arm and greater accuracy since your whole body is going in the direction of where you want to throw the ball.