<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://wdy.h-cdn.co/assets/cm/15/09/980x1372/54ebc8f412a19_-_04-woman-proper-walking-form-s2.jpg>
<http://www.womansday.com/health-fitness/workout-routines/advice/g1379/burn-calories-fast/>