Lol! So you must be a "runner" now if also thrilled in "bungee jumping" would you have called the first establishment the "bung hole"?
Well, I'm not into bungee jumping, so I wouldn't know. Also, someone might mistake it for a store selling barrel plugs. 
A Runhole is a runner who neglects their family, friends and/or significant others while training for a race, a very appropriate name for a running store, and might also be somewhat representative of the guy who built it.
