Knees cave under the reduced ankle restriction
Greater depth with elevation still exposes valgus weakness.
Overactive muscles
Adductor complexTFL
Corrective work
Foam RollAdductors↗Foam RollTFL↗StretchButterfly adductor stretch↗Greater depth with elevation still exposes valgus weakness.
Extreme heel elevation shifts all load to the quads; glutes disengage.