https://www.youtube.com/watch?v=QOgIl2n-tA8 There are certainly some incredible stories within the field of marathons, half marathons, or for that matter, practically any endurance...
Triathlon
http://tomdemerly.com/2015/11/11/the-rise-of-the-everyman-how-triathlon-is-changing/ Although the article above focuses on Dan Stubleski's win and tries to make the point that pros don't matter...
http://www.curearthritis.org/moving-with-purpose/ Sometimes it's not one's age that makes their accomplishment so impressive. As is often the case in triathlon, great...
http://www.triathlon-fitness.com/2014/07/09/from-couch-potato-to-ironman/ Kirk Robertson describes his journey from self-proclaimed "couch potato" to completing the Ironman Asia-Pacific Championship in Melbourne just 6 years...
http://www.slowtwitch.com/Interview/Random_AG_Dana_Bullard_5454.html A very nice interview with Ironman World Championships age-group (35-39) athlete, Dana Bullard. She finished in 11:28:32 with 3:58:35...