Running Form: Correct technique and tips to run faster
У вашего броузера проблема в совместимости с HTML5
Some tips on how to improve your speed and efficiently and while reducing the risk of injury. Video by USATF and Lydiard Certified running coach Sandi Nypaver and 2-time US Olympic Trials Qualifier Sage Canaday.
SandiNypaver.blogspot.com
SageCanaday.com