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Many of us find our jobs stressful, underpaid and the hours too long. But few would complain about work being less physically strenuous than in the past. And yet, new research shows that the decline in physical activity at work is key to explaining the obesity epidemic. So - is work now too easy? And if it is, can this be reversed? Producers: Estelle Doyle and Phoebe Keane Presenter: Michael Blastland (Photo: Office workers at desks using computers in an office. Credit: Getty Images)