Quoting *B & D Mommy*:" He apparently doesn't care that much and/or lacks motivation to do anything about it. I would just tell him that you want him to go with you at least a few days a week to help keep you motivated."
I might ask him if he'd do that. Our work schedules are opposite and I always to before work at 6 am but tuesdays and wednesdays I have to be to work early and can't work out, maybe I could convince him to go with me after dinner or something. And yeah, he lacks motivation, and he and I know it, and after a few years it's really starting to get to me (not just no motivation for exercising, other things too).