I still use the marine corps method... run, run until you feel like dying, then run some fscking more. There is nothing that will get you lean faster than running a lot. Swimming and cycling are very close though, but running still burns more calories per minute on average. You may see some weight loss lifting as others have suggested, but if you want to lose weight fast don't eat like a wild man and do lots of cardio. Supplementing the cardio with lifting is a good idea, but it shouldn't be the focus of your efforts.
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