You can readily see by searching that I have already pointed out that ALL exercise is cardio.
I agree with Nelson when he states that high rep lifting is the superior form of cardiovascular exercise. However, it must be done properly, number one, and number two, there is a greater risk of injury with this approach.
Specifically, the best exercise for this purpose is high rep squats, bar none. Windsprints are a similar type of exercise, and are VERY effective for burning fat.
An example of an am routine for getting lean would be as follows:
Stretch (I do it in the sauna).
Uphill walk on the treadmill for ten minutes, 4mph.
Windprints, 60 seconds each, at 12mph, rest two minutes, repeat, as many as you can do (five is tough).
100 reps of squats, light weight, any way you can get them.
(4X25, 3X33+1, 45,35,20, etc.)
And you're done. This is to be done, obviously, on an empty stomach and in the morning.
Feed throughout the day and then lift heavy at night for 30 min.
Nelson proposed the idea of resistance training as a form of cardio right on this board, I believe. I remember pointing this out myself not too long ago, maybe two months? I'm not platinum, so I can't do a thorough search.
Anyway, on the issue of resistance vs. non-resistance, I have to side with Nelson. He is absolutely correct.
That being said, there is a specific reason for including sprints, and that is to bring the body to its maximum exchange ratio and then beyond...
...this ultimately causes the body to produce more mitochondria in the muscle cell to adequately oxygenate the blood (and other reasons), and mitochondria are heat-producing cells. They are biologically active, and are the power house cells of the body. More mitochondria=more heat=less fat. This is why it is important to be in good cardiovascular health as well as good muscular condition. BOTH is best.
Let me say that it is my belief that one of the keys to success is the reaching of total failure. Every set, regardless of weight. When I say do a hundred reps on squat, the real way to do it is to just do as many as you can get, then do as many as you can get again, and so on, until you reach 100.
I will guarantee that anyone who does this daily, in the morning before eating, will lose fat like they can't believe. Be sure to ingest good protien immediately after the exercise is finished, within five minutes.
I am currently working on condensing the logic for a strategy for fatloss/muscle preservation, with supporting documentation. I will post it when I'm finished.