SportsBox Mid-Hands Thrust @ BCH—handle depth toward (+) or away (−) from Address at Backswing Club Horizontal (BCH). Distinct from lateral Mid-Hands Sway columns.
Units: inches
Why it matters
Makes DTL capture meaningful halfway back—bridges to Mid-Hands Thrust @ DCH and Club–Hand Gap.
When the number looks wrong or noisy
Mixing thrust with lateral sway columns invalidates handle-depth coaching.