This. Every neuron inside-outside is connected to the brain in some way, so it's flawed thinking to see them as separate.

Yep, connected forever. until we can upload our minds of course.

A lot of the times I just hit a few sets of pull-ups (on a bar inserted at a door frame) and push-ups when I'm waiting for my food to prepare.

I would like to do this but unfortunately the way the doors are made in the apartment makes it impossible. Crappy Finnish building :D