Premature Rotation (Lack of Separation): The hips and shoulders rotate as a single unit. This is largely initiated by an aggressive glove-side pull that opens the upper body too early. This severely limits the ability to create torque and velocity, forcing the arm to generate most of the force.
Open Stride and Unstable Front Side: The pitcher lands with his front foot open to the target, which prevents the hips from rotating against a firm base. The front knee remains bent and collapses upon landing, causing a significant leak of energy that should be transferred to the upper body.
Postural Instability: Significant head tilt and pull-off towards the glove side leads to a loss of balance and direction throughout the delivery. This makes it difficult to command the strike zone and puts the body in an inefficient, high-stress position to throw.