I finished 5 in about 58 minutes , with 2 walk breaks , but those I limited to 30 seconds . I was actually feeling really good , other than a slight pain in my left knee IT band . I spent about 10 minutes stretching on the grass before I got in the car to go home to try to work out any kinks . I was all set to jump in the shower as I walked into my apartment , only to get a phone call from someone at the rink telling me that the session I had thought was canceled , was in fact not .
According to the above context, answer the following question.
What athletic achievement may I have just finished ?


A marathon