Do you marathon? In 2013, more than 1,100 marathons were held in the U.S. with 541,000 finishers—an all-time high. That means 308,400 men and 232,600 women ran 26.2 miles at least once last year. And a record 254,300 of those runners were older than 40. If you are thinking about joining their ranks, check out our fun infographic with some essential tips on how NOT to run a marathon.  Infographic via http://blog.proform.com/?p=2182