optimal nutcracking height
An area of heights at which someone is easiest to perform a crotch shot on. This area is between the heights of 5'8 and 6'2, anyone shorter than this has a crotch too low to get an easy shot on and vice versa. People within this range have to live in constant fear of their testicles being kicked into oblivion.
If you want to kick someone in the balls first make sure they are within the optimal nutcracking height in order to calculate where you should strike