<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://rbk.h-cdn.co/assets/cm/14/51/980x551/548f23bec2ba3_-_rbk-outdoor-workouts-cross-country-skiing-s2.jpg>
<http://www.redbookmag.com/body/health-fitness/advice/g2032/outdoor-workouts/>