My oldest sister lost 73k in one year - her secret? She joined a gym (she couldn't even walk around the block without nearly passing out mind you) and got personal training. For that first year she was going 6 days a week (and walking the block on her day off). Her personal trainer made her do a food diary and made sure she was only eating fruit, veg and lean meat. It was ridiculous watching all the weight fall off her...I love telling people how she did it the old fashioned way....excercise and eating healthily!

Good luck