During the pitching delivery, a pitcher’s total body needs to get to the right place at the right time with the right sequence of movements. The Mustard app looks at all the biomechanical variables of the pitching delivery in a way that is much more accurate than the eyes could ever be.

As a pitcher’s shoulders begin to square up toward home plate, the glove needs to swivel so the palm is facing the chest and stabilize over the landing foot, inside the width of the torso, between the shoulders and the belly button.

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.