this's a video of a lesson of matej a wonderful teatcher who came from PARTS, and you can see him on the left... wahoo.
nice and easy, the nose in the same line with the knees
keep on going roll all the weight down
witch out bend your knees
the top of the spin now we are talking
the sit bomes autoerotic
its good BUT... 60% of the weight on the heels
the psoas 30% of the weight on the toes
relax your fingers