Weight lifting is just as important as cardio, if not more. It speeds up your metabolism more, gives you a toned look which would be very hard if not impossible with cardio alone, if all that is done is cardio your really hurting everything your working for. Once you get to the lower body fat % then its very very hard to gain muscle and lose body fat at the same time, it also depends on your body type though. And stewart I highly doubt that. Thats a lot of calories and I am certain thats not right. It cannot be done right without proper diet and excercise. Im just ranting now. have a nice day.