Basic flexion for a soft back, 31 min (introduction to simple flexion)

Basic flexion 2, 38 min (knees toward shoulders)

Basic flexion 3, 41 min (test lengthening legs with a long back)

Basic flexion 4, 38 min (foundation of the back: test angles and arcs with chin, lips, forehead)

Basic flexion 5, 33 min (foundation of the back #2, test elbows forward, hands on back of knees)