[stank345]

Can you provide a source for running being 5x better than walking? It doesn't seem that simple to me (eg. older people may suffer from joint pain or a risk of falling from more intense activity, so frequent walking may be better for them).

[ljhsiung]

5x is arbitrary and just how I chose to express the relative importance of doing nothing --> walking --> running. That's just my mental model.

I.e. walking has no excuse barring disability. Running I recommend, but not as strongly.

Put another way, I will endlessly nag my parents on walking. Running or jogging I merely suggest, given various costs like you point out.