A man defies gravity by doing a loop the loop on foot.
During circular motion, there are two main forces acting on the body – centripetal, the force that pulls you towards the center, and centrifugal, the force that pulls you away from the center. Many people have made use of this simple law of physics to defy gravity by going on a loop on skateboards and motorcycles. Damian Walter, a stuntman and gymnast, did it on foot. To achieve this he had to accelerate to a velocity of 13.84 km per hour at the highest point and keep his head and shoulders at the center of the loop.