У вашего броузера проблема в совместимости с HTML5
To do this workout with your own music, click here: http://youtu.be/3vKzp5Vpj4g
Sweet Spot training is a great way to increase your lactate threshold, so if you want to improve Time trial performance or hang with the fast group ride this is the workout for you. It’s important to keep a steady effort throughout the interval with no drop or peak
in pace.
Follow this link for advice on finding out your training zones.
https://www.youtube.com/watch?v=XoZoUMVbfMk
Top Turbo training tips.
https://www.youtube.com/watch?v=rQf-lwCj-zk&list=UUyrQSvn6_25rINepVZ6H0qQ