I have to disagree here.. I too have lost a considerable amount of weight! And you have to get a good diet in order to reach your full potential. I see people in the gym everyday who ride stationary bikes and walk on the treadmills some even jogging most moaning every minute...I have also seen many of them never reach their full potential because they can't/won't clean up their diets. I've been there done that moaning and all... Real changes will come when you get a proper diet in order. Cardio will only take you so far. It takes cardio and lifting and a complete diet overhaul to help you with a long term weight loss. Through learning to eat right you will be able to keep the weight off for good. It's easy to lose weight, it's harder to lose good weight(fat not muscle), and it's even harder to keep it off. Get the diet in check and find some cardio you like! Sports, something fun, etc. LIFT when your at the gym. Their's too much to see outside to run on a machine. Go out and do something for exercise. It will keep you interested a lot longer as well.

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You come into the world weak, and you will leave the world weak. What you do in between is up to you!