How to do an underhand serve<br>Get your feet into position. Stand with your non-dominant foot in front with your toes facing forward. Your dominant foot should be in the back with toes pointed slightly out.
An overhand serve will require a player stance that is the opposite of the underhand serve. 
( z1 require :ARG0 ( z2 serve :mod ( z3 overhand ) ) :ARG1 ( z4 stand :ARG0 ( z5 person :ARG0-of ( z6 play ) ) :ARG1-of ( z7 opposite :ARG2 ( z8 stand :ARG0 z5 :mod ( z9 underhand ) ) ) ) )