a new challenge

i bought these over my lunch hour today:
Asics Kayano 15




i am thinking i might use them to do this:

Rock 'n' Roll Las Vegas Marathon/Half Marathon, December 6th 2009


teacher sis and her friend are planning to go. this would be my first marathon experience...i would probably go for the half. makes me nervous thinking about it; what a goal! but if little sis can do it, i can too, right?