Tom, it's a couple days later and when I was sitting ont he floor last night with by buns it occured to me that I didn't ask you Louie's age. I'm guessing you don't know since you found him, so best guess is he's 3-1/2-4 yrs, maybe older.
4 yrs is sort of middle-age for buns. Their life expectancy used to be estimated at 5 years but now that buns are getting improved nutrition and are living indoors, they are living longer some vets now say 7-10 yrs)....since he seems to be such a mellow guy I'm thinking he just wants to sit in front of the tv, drink beer and eat.
Seriously, if you are worried about him not getting enough exercise you might cut back on his food (please tell me he does NOT get pellets)to keep him slim and healthy that way.

(pellets are fattening, wayyy too high in calcium and usually alfalfa based..very much a no-no for rabbits....besides pellets can, if the bunny isn't feeling snappy, slow down the guy moving the food from one end to the other causing the G.I. stasis and can kill a rabbit within a day or two. My rabbit-specialist vet says if you have to give a bunny pellets it should be no more than 2 Tablespoons/day!)

Good luck!