Considering CrossFit...

I am considering trying out CrossFit, have you tried it? I am not very athletic, in fact I am quitting smoking.. so you can imagine how much exercise I get in... ;) I was hoping some people on here might be able to give some insight so I could decide if it might be a good fit. I only worry that I wont be able to do it, and that I don't want to be overly muscular. My goal is to be more active, and to go from a BMI of 24 to a BMI of 22, and to have more energy and feel confident in a mini dress :P
Any way if you have tried it, tell me what you think

I have no personal crossfit experience but I want to quickly share about a book I'm in the middle of by Gray Cook. It's called Movement and was one of the best $10 I ever spent. The basic philosophy is movement, functionality, activity, lots of activity.

http://graycookmovement.com/
http://www.functionalmovement.com/store?page=3