Starting the 30 Day Shred!!!!!

As it turns out, I'm developing quite a bit of a "beer belly" as my mother AND father told me on Friday!

So I convinced my sister to do the Shred with me....

I'm really excited, because I'm hoping to lose about 5-10 lbs (preferably in the belly area ). I'm wondering if you really lose weight or you just build muscle (which would actually make me gain weight, right?)?

Basically, what should I expect? I read some other posts on here and some people said they didn't lose weight but just got into better shape.