When I was that age my main exercise was commuting by running or biking. I got additional sporadic exercise doing miscellaneous sports. Having kids made it very hard to do more than that. I’m not working now and have the time and energy to do much broader and consistent exercise.

Turning your commute into your exercise regimen is great. Be warned though that the human body is great at optimizing and will quickly adapt to that specific routine. When you vary off that routine you’ll find you’re not in as great of shape as you thought. But you’ll be miles ahead from where you’d be otherwise.

That’s what I use too.

I set it up a while ago and don’t have a good resource for setting it up now. Once I got it set up it has worked well. But like I said it seems fragile. When I upgraded fedora a couple of years ago it broke. I think it might have been the wayland transition. I switched from Nvidia to AMD. But I’m not sure that’s necessary. My wife and I have two workstations on one computer. It works well until it breaks (if you want to live with end of life software it may not break). For whatever reason multiseat doesn’t seem to be a mainstream feature. But I like it and have been using it for many years.

https://wiki.debian.org/Multi_Seat_Debian_HOWTO

Loginctl is the tool you use to assign hardware to different seats. Also I’m not sure every login manager supports it. I used GDM.

The open source community feels like the ultimate right to repair environment. You’re right, it feels very empowering and fulfilling. Totally opposite of the frustration of dealing with often intentionally unrepairable products.