hah. onlyhestands talks of wrestling wildlife like bears and wolves to death. and his profile picture is of one Mr liver eating johnsen, one of those hardcore american pioneering types who probably did that sort of thing for real.
ive heard reccomendations for finding something like a zombie hoary marmot, disabling your own strike back response so you dont accidentally kill it, then lying on the ground next to it to level armor and shield use while you go away to make yourself lunch and watch tv.
also, if you are after wrestling, grabbing small helpless animals and methodically breaking every tiny bone in their body is aparently a good way to go. as well as whenever something gets badly hurt, falls over, or falls unconcious and cant fight back. although i dont know if you get the same xp bonus from unconcious enimies.
i think clothes stealing may also work to give xp to wrestling. aparently you can do this to sleeping people without waking them up. dont know if that is counted as stealing if you do it in town though.
not tried any of these things myself, but they are worth a go.
EDIT: oho, here is the thread i saw some of these things in -
http://www.bay12games.com/forum/index.php?topic=30225.0lots of good ideas in there. aparently using a weapon on anything asleep or unconcious gives no xp, but wrestling does. also, they reccomend finding something small, undead and mostly harmless, like the afforementioned zombie hairy marmot, and spending a few days attempting to strangle it to death, running away when exhausted. because zombies dont need to breathe it wont die that way, and you will skill up fast. i find that hilarious.