Hi Adrienne
I too was an avid marathoner, I have run 11 of them. When I was diagnosed 2-3 years ago, I thought that I was going to die without being able to run and marathon. It was my life. After a hard transition and many months of only yoga, swimming and stationary cycling (plus 12 hours of sleep a night :-)) I am getting back into running and have been running 2 - 5 times a week only 2 - 4 miles. My Doc says that any exercise will and cannot irritate AS, so when I feel good, I lace up and hit the roads. Ran 5K this morning. Hot as blazes here in Boston, 90+ degrees F, but I am so appreciative to be back on the pavement!
So you hang in there, and look forward to the time when your AS will settle down some, and you can lace those sneakers back up and hit the roads again!

Here's to your running!

Best Regards,

Ellyn