[thetallstick]

Actually, I think this is a decent thought experiment. IMHO it would depend a lot of what is included and not included and what definition of profitability we used.

For example, if I spent less money would that also count as more profitable? Does it also take into consider what activity was replaced by running?

Spending 30 min less on HN and replacing it with running, or just moderate walking, could very well result in less expenses if one takes medical spending into consideration.

And I think that's what Caplan is asking people to do. Go over his definitions and what was included and see if it makes sense.