Ask your self this question, "How much good does a cardio work out do me?" If you are like most people you think that spending an hour on an elliptical machine will melt away fat because that is what the common logic is. But guess what? It won't. That may sound like a bold statement but I myself have experimented with this very concept. I did cardio kickboxing an hour 4 to 5 times a week with a healthy diet for a year and lost about 5 lbs which came back quickly. Read the article below for why this is the case.
Now...I am not here to tell you to stop running, biking, or swimming long distances if that is something you truly enjoy (I don't think anyone can honestly say they enjoy long bouts on an eliptical or some other mindless hamster wheel). But if you are doing these activities to lose weight...you are wasting effort.
What should you do. Sprint hard and fast, lift heavy objects, and constantly change what you do. I am living proof. I lost 40 lbs in a 5 month span and kept it off. I have put on weight but that is in muscle. I can lift heavier weights (went from a 275 lb to a 400 lb deadlift in a year) and I run a sub 18 minute 5k. Lets see cardio give results like that!