Biggest looser challange

My company has started a biggest loser challange and I am going to compete. I guess I should tell you a little about me. I am 6"1 1/2 260lbs. I lift weights everyday and I am very active with sports. My desire is to drop 30lbs during this competition. I don't want to lose muscle so I will have to be careful during this time. I have 2.5 months to lose the most weight.