It's been a few weeks since I finished my Boston Marathon re-do, and while the whole event was memorable from start to finish (most especially the cheers from the crowds that helped motivate all us runners), it wasn't exactly an easy process. Now that my four months of training are over, I can say with certainty that I'm glad I did it — but I won't be clamoring to sign up for another marathon anytime soon. Here are 10 reasons why.