<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://rbk.h-cdn.co/assets/cm/14/50/480x640/548a5bda0b972_-_rbk-9-exercise-mistakes-slide-2-msc.jpg>
<http://www.redbookmag.com/body/health-fitness/advice/g1133/workout-mistakes-to-avoid/>