Fluid Deceleration Path: The throwing arm exhibits a full, fluid arm deceleration path, extending toward the plate and finishing across the body — a pattern that is critical for protecting the arm during the follow-through.
Adequate Pronation Pathway: Through deceleration the pronation pathway appears sound, helping the arm shed force safely even while working against upstream timing faults.
Lead Leg Block Failure: The lead leg fails to brace and extend at foot plant, producing a ‘soft front leg’ that absorbs energy instead of transferring it. For a 235 lb athlete, the inability to stop his forward momentum on landing creates major energy leaks and forces the arm to overwork.
Arm Drag & Medial Elbow Stress: Premature pelvic rotation leaves the arm late relative to the trunk at foot-plant, placing the hand behind the elbow. This ‘arm drag’ significantly increases valgus stress on the UCL and is a primary elbow-injury risk factor.
Inefficient Deceleration: With the body traveling forward over a bent knee, the delivery decelerates abruptly, forcing the posterior shoulder to manage excessive eccentric load through the finish.