<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ell.h-cdn.co/assets/cm/15/02/54ae88b537179_-_1405965710-jack_split2.gif>
<http://www.elle.com/beauty/health-fitness/news/a24987/3-exercises-that-work-better-than-jumping-jacks/>