You sit on top of heels. You try to get back to the floor straight while bending backwards. A picture is here. The ideal position has the lumbar spine almost touching the floor, specifically the vertebrae such as L4-T7 closer to ground. Anatomically, this is related to muscle chains connecting psoas, hip flexors, back muscles and tight hamstrings.
How can you improve the sitting on heels position with backwards bend?
What is the name of this position? Its yoga name? Its fitness term?
How to improve the position?
Is the anatomic analysis correct about hip flexors, psoas, back and hamstrings? How to find more specific muscles?