Taken from here
http://www.bodybuildingforyou.com/articles-submit/lynn-vandyke/cardio-vs-strength-training.html
":limit your cardio and increase your strength training. That's it. Sounds simple and, if I am to tell the truth, it is simple. This very basic concept causes many people to think I've lost my brain. After all isn't cardio the ultimate fat burning workout? Nothing beats 45 minutes on the treadmill. Right?
Wrong. The reality and cold hard truth is that strength training is the best and surest way to increase your metabolism, burn fat, and sustain long term weight loss. Cardio is important, but not nearly as important as many Americans believe it is."
It has to do with post exercise oxygen consumption (EPOC) and hormonal changes that strength training give you that cardio doesn't. If you don't believe me, look it up.