Isn't there a wrestling based anime? I bet that's something he could easily get into.
Be careful what you wish for...
Kinda surprised I didn't see any mention of Magical Witch Punie-Chan (Dai Mahou Touge) until now, but the protagonist basically just beats everyone up with some fancy wrestling tech to comedic ends.
Now... there is an anime about actual wrestling in the ring in which an idol tries her hand at wrestling called "Wanna be the Strongest in the World" but I still think Punie-Chan is cooler. Also, this particular wrestling anime is a little extreme on the fan service, so I dunno how that'd fly for Dan.
Also, Kill la Kill is pretty wrestling for something that doesn't actually contain wrestling!