<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://sev.h-cdn.co/assets/cm/15/09/320x240/54eed1074f577_-_sev-fitness-classes-trampoline-de.jpg>
<http://www.seventeen.com/health/advice/g266/craziest-workout-classes/>