Social media has significantly impacted health and fitness by allowing easy sharing of accomplishments, injuries, and disappointments with online communities at users' fingertips, helping to motivate continued exercise progress that some track by tweeting along the route of a 13.1 mile half marathon race. The presentation discusses both traditional fitness influences like magazines as well as new tools like blogs, videos, and Twitter that have expanded online communities and support networks for runners, yogis, and others tracking healthy lifestyles.