<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://rbk.h-cdn.co/assets/cm/14/51/980x1507/548fe89dedb3e_-_rbk-fitness-apps-instant-heart-rate-s2.jpg>
<http://www.redbookmag.com/body/health-fitness/advice/g1439/fitness-apps/>