I study, mostly. I've been trying to learn as much as I can about this place. [ He can't train to improve his muscle mass. But he could absolutely train something like martial arts, to get better at controlling and using the body he already has. Not that it crosses his mind. ]

Someone with engineering knowledge commented how my body is seemingly made to be customizable. If I had specialized set of limbs to some kind of task, it wouldn't be hard to just swap them. [ Bettering himself = getting upgrades. ]