<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://wdy.h-cdn.co/assets/cm/15/09/768x516/54eba101d028a_-_knee-to-chest-xl.jpg>
<http://www.womansday.com/health-fitness/workout-routines/advice/g765/exercises-for-back-pain/>