Hi LAura, welcome to steemit!
I haven't ran any marathons yet in my life. Until a few years back I never ran in my life. I'm turning 40 in October next year and now that I'm running on a regular basis I want to do 1 marathon before I'm 40. So that's what I'm posting about in a nutshell.
The @runningproject is a way to motivate runners to keep running. You need to apply and pay a small fee for a lifetime membership. They will then upvote every post that you make. That's it in a nutshell.