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> The evidence for physical activity being good for just about every ailment under the sun is about as incontrovertible as the evidence for water being wet.

No, it isn't, but people really, really like to think that it is [1]. Like most other interventions worth talking about, there are situations it improves, situations where it doesn't change much, and situations it worsens (those "consult your physician before starting an exercise program" disclaimers aren't just for show).

[1] http://blogs.discovermagazine.com/neuroskeptic/2010/11/30/ex...