Speed Gain (Chest to Arm)
What it measures
Player Plus modeled ratio translating peak torso (chest) kinematic dominance into downstream lead-arm peak speed—mirror the Efficiency / kinematic Gain label from SportsBox verbatim. Distinct from Release Factor (mph) and from positional X-Factor degrees.
Units: ratio
Why it matters
Targets kinematic whip efficiency between torso and arms before wrists release.
Curated YouTube drill videos
Vector matches drill videos to your focus—contact, shot shape, start line, D-Plane.
Related metrics
Chest Turn Speed Max, Lead Upper Arm Swing Speed Max, Speed Gain (Arm to Shaft)