If I want to complete a full triathlon. I'll have to complete a marathon first. So this is a step in between.
All of the characters in my favorite shows run marathons. All the cool kids do it!
I've just always wanted to do a marathon
I want to run a marathon at a respectable pace. Completing a marathon is great, but completing a marathon in under the 4 hour mark is impressive.
I completed a half marathon in October 2010. The feeling of accomplishment is indescribable...all I could think when I crossed the finish line is "I DID IT!"