<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://rbk.h-cdn.co/assets/cm/14/50/768x516/5489881e7fda5_-_rbk-9-exercise-mistakes-slide-5-xln.jpg>
<http://www.redbookmag.com/body/health-fitness/advice/g1133/workout-mistakes-to-avoid/>