In a pitching delivery, energy is transferred from the ground up, through the legs and into the torso. Up to 80 percent of that energy is then carried into velocity by angular torque. The final 20 percent of that energy is transferred through linear torque in the torso.

In just one year, with the help of coach Tom House and Mustard, pitcher Justin Courtney went from training solo in Maine to closing for the Los Angeles Angels Low-A affiliate, the Inland Empire 66ers.

As much as they’d like to and no matter how hard they try, not every pitcher can throw as hard as Aroldis Chapman.

By Lindsay Berra Eddie McCartney’s journey to Mustard began in a batting cage rather than on a pitcher’s mound. Eddie was 9 years old, and he was afraid of the ball.

When done properly, even a pre-adolescent can use weighted balls to build strength and speed in the pitching delivery.

A pitcher’s drag line – literally, the line the back foot makes in the dirt - clearly show whether or not your body is where it should be during the pitching delivery.