Ah the proof. Nelson finally posts his logical proof that cardio does not work. let's see , what is it, oh, the fat finishers at marathons are those that have trained for so long that their bodies have adapted and are now fat because running 26 miles has no meatabolic effect. Go to the head of the class. 
jb

jb
Nelson Montana said:Okay, why not...
Quick points.
Everyone who talks about how much weight they lost doing cardio started out overweight. ANY exersice will make you lose weight if you're overweight and overeating.
Fact:Cardio is exercise. PERIOD! It is nothing magical. It is simply activity. Anything it does, weight training does better.
Why are people dissing the author of that piece because he's a Chiropractor? Are the people who disagree any more qualified? I know many chiropractors who will tell you they see more messed up knees from...quess who? Runners.
And by the way, here in NY they hold the Mrtathon every fall and my wife and I usually go to Central Park for the finish -- and let me tell you -- we see A LOT of fat people crossing that finish line. (Except for the top guys from Kenya who weigh 120 pounds)
Zyg is right that the body adapts to any activity but he overlooked one simple fact -- weight training is by nature progressive. The resistance increases as you progress. That isn't the case with aerobics. And as proven by the fat finishers of the Marathon, after a while, the ability to execute the activity provides no alteration of body composition.
Now feel free to disagree. (But you'll be wrong).