<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/cm/15/11/54fecd4b87ece-jump-rope-heart-nmfbns-mdn3.jpg>
<http://www.goodhousekeeping.com/institute/a19578/holiday-season-fitness-advice/>