How are we defining hobbies here? Coz if we are using it as something we do on a regular basis then I have nothing.
But hobbies that I never/rarely do include knitting, tennis, scrapbooking, writing, cleaning, working, planning and hiking.
I also love swimming too but I don't always get the chance to go.
I'd say yaoi, but yaoi is much more than a hobby. Yaoi is life.