i have beat the game about 5 times since i got it. and we're talking a LONG *** time ago.
i had it the year it came out n decided to play it again since i didn't remember too much
on how to beat it. i am stuck at this same part you are at, however i think before you
knock him out you have to either have full body skill points, or catch the veloci rooster
or w.e..or maybe both..
have you beat him yet? your question is dated like..a month ago..

buy a potion from the virtuchem labs,your sim automatically drink it,then go to the
flex-dome fitness center you will ko mad willy big butt

pwn his ***