how to "get out of" a 5k

beenbizzy

I signed up for a 5k with some friends many weeks ago.  It is on Sunday and I will be ~7 weeks.  If I had trained for this properly, it wouldn't be a big deal. But I haven't trained at all.  The plan was to walk/run with two girlfriends.  Run until we are tired, then walk, run when we feel good, repeat...

 Since I haven't trained, am pooped tired and seem to be out of breath with a slight jog, I'm wondering how I can get out of this race.  I would totally walk the whole thing, I just don't want to run.  I also don't want to just "call in sick" as we have other plans with these girlfriends and spouses for supper that night. 

Fake an injury?  Other ideas?