Taekwondo 2D - Inner Knee Stance ( 오금서기 ogum-sogi )
Inner Knee Stance from Taekwondo Preschool
Crane Back Stance in the form Ilyeo
A Crane Back Stance (also called Inner Knee Stance 오금서기 ogum-sogi is like a Back Stance except the off-foot is held behind the knee of the standing leg. The raised foot should wrap around the back of the standing-leg's knee.
The Crane Back Stance appears, for example, in the form Ilyeo.