who's a slacker? this girl!

I TOTALLY fell off of the exercising wagon.  I mean, I didn't just take a quick vacation and get back, I completely deserted it.  I've definitely paid the price.  I'm back to once again being totally out of shape and disgusted with myself.  I went to a wedding over the weekend and the pictures....lets just say, i'm not thrilled and i'm pretty disappointed in myself once again.  I let that disappointment kind of kick my behind back in the right direction today.  I went to Zumba for the first time in weeks.  I'm totally feeling it, but I'm feeling pretty good about myself.  Now to get back on the running track.  On July 8th my friend and I are ringing in her birthday by running the color run that morning in philadelphia.  Will I or won't I be prepared?  I want to see at least some improvement, and that run is in 3 weeks, so I really need to try.  I just get so frustrated and disappointed in my lack of being in shape and I think thats what causes me to just give up.  I need to figure out a way to stay motivated.  What are some things that keep you on track?