У вашего броузера проблема в совместимости с HTML5
http://www.resistancebandtraining.com and the band man Dave Schmitz shows you how to have fun training young athletes with resistance bands
Here you can learn more about the importance of the setup
http://www.resistancebandtraining.com/2012/02/resistance-band-setup-that-will-change-how-we-train-with-bands/