X-Factor @ TOP
What it measures
SportsBox-style X-Factor at TOP: torso–pelvis rotational separation measured in degrees at the same TOP key-frame—conceptually Chest Turn minus Pelvis Turn per SportsBox nomenclature. It is angular stretch at setup of transition, NOT the Downswing Core speed gain factor (which compares peak rotational speeds later). NEVER mix this metric with sway gap inches or speed ratios logged elsewhere.
Units: degrees
Why it matters
Single-number summary of coil stretch; coaches pair with Chest/Pelvis Sway/Lift stacks and Mid-Hands traces at TOP for quality control.
Curated YouTube drill videos
Vector matches drill videos to your focus—contact, shot shape, start line, D-Plane.
Related metrics
Chest Turn @ TOP, Pelvis Turn @ TOP, Speed Gain (Pelvis to Chest), Sway Gap @ IMP, X-Factor @ IMP