<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/cm/15/11/980x1433/54ff06bff2bf8-ghk-skip-seated-leg-extenstions-5-s2.jpg>
<http://www.goodhousekeeping.com/health/fitness/g596/dangerous-exercises/?src=shelter_footer>