When it's warm like it is now down here, my dog, Jelly Roll, and I stalk the ducks in my lake. I can get so close that I swear I could grab one, but I want to keep them coming back, so I usually end up chasing down Jelly.
I used to chase her on all fours (this does wonders for your upper body; I have very muscular forearms), but I broke my hand recently, so, as John Cleese said, that avenue of pleasure is closed to me now. :P