Straight Elbow (Sun Palkup)
This is mainly executed from a rear foot, close, L- or
X-stance though occasionally from a walking,
parallel, one-leg or vertical stance also. This
technque is chiefly used for attacking the upper
back, small of the back in the form of downward
thrust. Keep the back fist facing the front and the
forearm vertical at the moment of impact. However,
it can also be used for defense in rare cases.
Downward thrust
(Naeryo Tulgi)