1) Gym whim 2) Gymnastic balancing feat 3) Gymnastic exercise 4) Palms down feat 5) Palms-down feat 
A handstand is the act of supporting the body in a stable, inverted vertical position by balancing on the hands. In a basic handstand the body is held straight with arms and legs fully extended, with hands spaced approximately shoulder-width apart. There are many variations of handstands, but in all cases a handstand performer must possess adequat...
[n] - the act of supporting yourself by your hands alone in an upside down position
One of the basic skills in gymnastics, and some version of it shows up on each of the four events. Learn how to do a handstand.
noun the act of supporting yourself by your hands alone in an upside down position