I give you some tips and you can be considered a semi-pro
in the field of martial arts if you practice them.
1) Aim the vitals (Between the legs).
2) Pretend to hit elsewhere but main focus is inflicting as much
impact as possible on the vitals.
3) Distract your target. Strike when the the legs are the most
wide open or hip exposed for instance when target does a high
kick.
4) Chain Combos. Once the vitals are damaged you will have at
least 3 extra seconds to work more kung-fu on his vitals till
he give up/cant move.
5) Smile and give eye contact to your target. Eyes look at
his eyes, but always take note of the position of your
target's vitals using your lateral/peripheral vision.