> Physical evolution does not keep up so well with modern society's pace of change and understandings therein.

Indeed, we are all stone age hardware trying to run modern software.

My uncle would say he was analog in a digital world.

Evolution is trying to kill you off; if you want it to work faster, stop fighting it!

> walk for an hour most days

I've started doing the 10,000+ steps for a couple of years, and yes there does seem to be a difference to my health and energy.

Why shouldn't it, all parts of the body needs a frequent stimulation, otherwise process of minimizing energy output (ie for tissue maintenance, repair of muscles and joints, etc.) kicks in.

Our bodies are a bit dumb in this, albeit with good intentions - momentarily preserve energy, make body weaker long term. It made sense in the past though, otherwise we wouldn't be probably here.

Yes indeed, its interesting the different quantities I've noticed - like up to 17,000 my body really ramps up, I could do that every day, and often do, but I did 30,000 the other day I was tired the next day. Though when I started 5,000 was a major achievement. I'd love to see wider studies on this, like do muscles change? and how etc. I guess sports science focuses on athletes, Is there much average Joe science? apart from weight loss. I'm amazed also at how easy walking is, and how little calories I burn walking - which is why I started - to lose a few pounds.