Your desk chair just became a suspect. A study of more than 90,000 people, published July 2 in PLOS Medicine, found that prolonged, uninterrupted sedentary time was linked to a significantly higher likelihood of dying from cancer. Every additional hour of prolonged sedentary behavior per day was associated with a 10% higher hazard of cancer mortality. The good news is that interrupting that sitting with even light activity cut the risk. Replacing one hour of sedentary time with light...