Young athletes account for about 4 million injuries a year in the U.S. Of course, playing sports comes with an inherent risk of being hurt. But there are some types of injuries this expert says may be preventable.
Brian Grasso, founder and chief executive of the International Youth Conditioning Assn., speaks with Chicago Tribune fitness writer Julie Deardorff during a live Web chat Tuesday at 10 a.m. PST. Join the online discussion to learn about everything from ACL tears to concussions.

