[jokethrowaway]

OSS sounds like a terrible idea.

Little human interaction, lots of toxicity from entitled developers.

Development could be a nice hobby but it's not easy on the eyes and doesn't make you move.

Get him into stretching / light fitness / bodyweight training: it can definitely become a passion / hobby and will keep him healthy (within limits)

[thesecretsquad]

This seems to be the sentiment from others as well. I'll probably refocus efforts on finding a less isolating and arduous hobby and instead look for more social, physical, and entertaining hobbies. Thanks for your input.