Out of curiosity (and waking up way too early in the morning) decided to look at the make up of the people who finished the the Atlanta Half Marathon in the last three years - 2011, 2012, & 2013. Consistently the women out number the men. Over that three year period 11,691 women have crossed over the finish line compared to the men at 11,254.
Digging a bit deeper, I categorized these numbers by age group. The findings surprised me. I'm not sure what it means or if it means anything at all, but it is interesting. Over the three year period, the women consistently out number the men up age 39. From age 40, the men consistently outnumber the women. Again this is a small sample size. But I was intrigued by these numbers.