У вашего броузера проблема в совместимости с HTML5
Here's a video version of another very popular subject on my website. If you'd rather read it (and find some additional details) Go here: http://giryagirl.com/The-Sissy-Challenge-Revisited-kettlebell-and-burpee-high-intensity-cardio-workout-with-multiple-variations-scaling
For a bunch of workouts, recipes, adventures and more (no signup required) visit my website: http://giryagirl.com