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Comment by jsprogrammer | Hacker News Reader

Where have those physics been documented?

I want to see the same person:

    'immobile
    'sitting most of the time, with short commutes and shopping trips
    'intensely exercising 1 hr a day
    'actively working out throughout the day

while maintaining their current diet and weight.

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These aren't independent variables. The point is that a half an hour run only burns around 300-400 calories, a deficit which could more easily be accomplished by diet. Also, it's possible that the run would increase your appetite.

The point isn't that exercise _can't_ work, it's that aiming for dietary changes has a higher average ROI than exercise.

"these"? I don't know what that refers to.

No one has argued that there is a lower than average ROI (you get paid for not eating?) from exercise.

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