headsit

noun1

1. •
   An extreme backbend in which the top of the performer's head touches the buttocks; usually in a handstand or chest stand. Sometimes, a more extreme variation is done where the buttocks are positioned past the performer's head, while the lower back is on top of the head; this requires much more neck flexibility.

   • The contortionist impressed the audience with a perfect headsit during her routine.
   • Achieving a headsit requires years of practice and extensive spinal flexibility.