I don't remember coming across any research proving causation over correlation. From a quick Google search, there are a couple news articles (with direct links

I don't remember coming across any research proving causation over correlation. From a quick Google search, there are a couple news articles (with direct links to the journal articles) about extra-curricular exercise not removing harms (which is all I meant to note in my OP): - http://qz.com/223160/why-not-even-exercise-will-undo-the-harm-of-sitting-all-day-and-what-you-can-do-about-it/ http://qz.com/223160/why-not-even-exercise-will-undo-the-har... - http://www.cnn.com/2015/01/21/health/sitting-will-kill-you/ http://www.cnn.com/2015/01/21/health/sitting-will-kill-you/