<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://rbk.h-cdn.co/assets/14/50/980x490/548a5bd9a4227_-_rbk-9-exercise-mistakes-slide-1-xln.jpg>
<http://www.redbookmag.com/body/health-fitness/advice/g1133/workout-mistakes-to-avoid/>