The "ghost writer" Vernon Loeb is a runner as well.
http://athlinks.com/racer/68529625
Rock 'n' Roll USA Marathon & Half Marathon 2012
3/17/12 — Washington, DC
3:28:12
Washington's Birthday Marathon 2012
2/19/12 — Greenbelt, MD
3:35:11
Philadelphia Marathon 2010
11/21/10 — Philadelphia, PA
3:24:48
Marine Corps Marathon 2010
10/31/10 — Washington, DC
3:37:37
Philadelphia Marathon 2009
11/22/09 — Philadelphia, PA
3:17:11
ING New York City Marathon 2009
11/1/09 — New York, NY
3:22:50
http://www.washingtonpost.com/lifestyle/style/petraeus-ghostwriter-clueless-to-affair/2012/11/12/c1271634-2ce4-11e2-89d4-040c9330702a_story.html
"The fact that I was a runner seemed to Moyers to make me the perfect fit for the job. He joked, when he was introducing me to Broadwell, that I was the only ghostwriter who could run with Petraeus — and with Broadwell. Both were ultra-competitive distance runners who prided themselves on speed, and both could do hundreds of push-ups."
"We drove six miles out along the Potomac, were dropped off, and ran back along the dirt tow path. The commander of the war in Afghanistan and I ran side by side, talking about great world events. I could scarcely believe I suddenly had this kind of access."