OP doesn’t even mention SHTF in his post. Isn’t there a good need for fitness even if society stays stable? I think so. Go visit a nursing home and observe why most people are there.Curious. Not trying to hijack thread or be a tool.
What type of shtf scenarios do you have in mind that will require you to run for your life and only take what you can carry with you ? Do you live in a rural area ?