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(THE CONVERSATION) Every 365.25 days, when the Earth completes a full orbit around the Sun, we humans have the opportunity to hit the reset button and become fitter, finer versions of ourselves. As usual for January, social media is humming with advice on how to eat better, exercise regularly, lose weight and remain healthy. We feel particularly invincible at this time of year, armed with renewed vigor and motivation to purge ourselves from previous indulgences and our couch-potato...