<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://mac.h-cdn.co/assets/cm/14/49/547d18c142ebe_-_rb-side-plank-3-0809-lg.jpg>
<http://www.marieclaire.com/health-fitness/news/a1205/power-up-exercises-part-3/?click=rel>