I think you missed the point of those sorts of studies. It's not to prove that exercise is good for us, but to provide quantifiable evidence of that benefit. And more so, to help determine *exactly* what kind of exercise is *most* beneficial in which *specific* cases.
Is vigourous exercise better than moderate exercise, or is light exercise enough? Is there anything which counters the effect of exercise? Could certain ailments be made *worse* by exercise, counter to intuition?
Remember, the medical world used to be convinced that bleeding patients was a good thing. The physicians saw what they thought was 2+2 = 4, but didn't realise it was actually 2+(ab*cd)+2-x^2 = 4.
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