Swing Analytics (Sportsbox-style positional metric).
What it measures
SportsBox Pelvis Sway @ DCH—lateral hip displacement versus Address at DCH paired with Chest Sway @ DCH reads from the identical export row.
Units: inches
Why it matters
Slides versus rotation become obvious once Pelvis Turn @ DCH joins this trace—guides early extension diagnostics before impact thrust rows.
When the number looks wrong or noisy
Trail ankle collapsing can mimic pelvic sway spikes—film foot pressure cues alongside numbers.