[__derek__]

I think "exercise" and "working out" are probably the wrong target because they're kind of pointless all alone. The key is to find something physical that you can get (mildly) obsessed with doing, then create a mechanism to get you to do it regularly (e.g., a Couch to 5k plan, a pickleball league, a climbing course). At some point, doing that thing will become your default behavior, just as doing whatever you do now is your default behavior and doesn't require motivation/willpower. It might even lead to other training to get better at that thing.