This article provides some insights and links to technology that can be used to teach PE classes. Some of the tools that the author links to are apps that turns exercise into games and help track fitness progress. This article is a good, short resource to use if you are interested in teaching PE with technology or just want to discover some useful fitness apps.
One of my favorite blogs for discovering new tech to use in the classroom. This is a recent post that focuses specifically on student health and using technology to provide in-classroom physical activity.