In this Feb. 17, 2016 still photo from video, Dr. Michelle Johnson discusses prescriptions for exercise that she issues to patients at Whittier Street Health Center in Boston's Roxbury neighborhood. Doctors treating chronic health problems increasingly are prescribing exercise instead of medicines for their patients. At one health center in Boston, primary care physicians, internists and psychologists prescribe access to a gym for $10 a month. (AP Photo/Rodrique Ngowi)
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