Physics, years of evidence and common sense down voted on HN where solyent is seen as a good thing.
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
The point isn't that exercise _can't_ work, it's that aiming for dietary changes has a higher average ROI than exercise.
No one has argued that there is a lower than average ROI (you get paid for not eating?) from exercise.
But it's more complicated than that. Genetics cause one's predisposition as to how responsive a person is to cardio; see the University of Bath study and/or Michael Mosley's "The Truth About Exercise".