Today it’s the opposite, Meister said. Pitchers apply a “death grip” to the ball, essentially pre-loading every muscle in their arms. At release, those muscles

Today it’s the opposite, Meister said. Pitchers apply a “death grip” to the ball, essentially pre-loading every muscle in their arms. At release, those muscles acutely lengthen in what is known as an “eccentric contraction.” The result can be almost like a hamstring tearing, affecting different pitchers in different parts of the arm.