On paper the blind heel trick sounds impossible: Propel the ball over your head so it drops perfectly onto your heel.
In the absence of vision, you have to sense the ball's trajectory, timing your connection to perfection.
More after the break
An added complication - you have to get enough power on the touch to loop it back over your head, with your feet ready to resume the juggle.
Watch world champion freestyler John Farnworth demonstrate the trick with ease, explaining the intricacies of the move along the way….