A moon kick, commonly referred to as Kick the Moon, is a type of gainer trick used in martial arts and tricking.
The moon kick itself is preceded by an extra spin to gain momentum.
The path of the run before the moon kick is in the shape of the English letter "J".
The moon kick originated as a variation of the gainer flash trick.
Eventually it gained its own name which came from the motion in which the person performing it kicks "towards the Moon", or in an upward direction.