<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/cm/15/11/980x752/54ff67fe6b0ae-06-168162762-s2.jpg>
<http://www.goodhousekeeping.com/health/fitness/g1325/calorie-burning-winter-activities/>