Kaleigh Camp, M.S.Standing at the starting line of the 2011 San Antonio Rock ‘n’ Roll half marathon with over 30,000 other runners, it was clear how popular these races have become for athletes as well as non-athletes. Running USA, the track and field running information center, acknowledges the surge over the past quarter of a century. At the beginning of the race, salt packets were provided and passed around the population of runners. I wondered whether all runners understand the p...