<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://mac.h-cdn.co/assets/cm/14/49/547d18c4c562f_-_rb-crossover-step-up-6-0809-de-large_new.jpg>
<http://www.marieclaire.com/health-fitness/news/a1205/power-up-exercises-part-3/?click=rel>