history: I'm always proud when I set my sights on something and achieve it. Running my very first marathon was a big one! Running my first (and maybe only!) marathon felt like *such* a huge accomplishment!
current: Wow, that is an amazing accomplishment!  Congratulations!  You gotta be feeling like you're on top of the world after that!
next: Ah, it was the best! Plus it helped that I purposely chose an amazing destination in which to run it -- it was the Venice Marathon!