Don't bother with a cross fit gym...they are expensive and you can do anything they do there in your own local gym. That said this the workout is great, but diet is what you need mostly to lose that kind of weight. Follow this link and follow the program EXACTLY and you will lose that weight and more. I lost 18lbs is 7 weeks and my strength increased enormously. I'd be glad to tell you more if you care, just let me know. I can assure you though that if you don't follow the diet, you will NOT lose that kind of weight. Overall its a good program though and there is a forum associated with it for motivation and help along the way. Daily videos if you are new to working out. Its pretty comprehensive. The only thing you can kind of pick and choose on is the supplements. Just make sure to have a good multivitamin, protein, bcaa's, and glutamine. I would suggest a pre workout to give you a little extra energy for the workouts because your body is going to beat after the first week. I used creatine also, but again thats personal preference. Most of the other stuff he suggests really didn't do much for me and is probably more of a waste of money than its worth. Good luck and let me know if you need any more info or have any questions about the program.
http://www.bodybuilding.com/fun/kris...ner-intro.html