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(faz @ Oct. 07 2006,06:34)</div><div id="QUOTEHEAD">QUOTE</div><div id="QUOTE">health reasons are one...also the heart and lungs are muscles and can only be exercised by cardio,they help push the blood to the muscles which inturn help you to work out with weights.
also the fitter you are the better your body is at food partitioning..ie..storing fat etc.
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Slow down boys.
Weight lifiting increases the strength of the heart and blood vessels.
Cardio, in its ideal form, is for training endurance, i.e. several hours of running or biking or whatever.
It is wrong to think that your cardiovascular system is not getting a good workout through weightlifting---it is getting a good workout-but different than endurance training. One hour of cardio doesn´t do that much for endurance. For the unfit, it helps a lot, but the guys and gals on this board who train regularly, the 45 minute cardio does little more than burn calories, not fat. If you want to do cardio to burn fat, you gotta do it for at least two hours, 3 or 4 times a week. Then the body "LEARNS" to burn stored fat.
HIIT style areobics is great for increasing lung volume and burning calories, but does little to burn fat fast.
Lift hard and your heart and blood vessels will get what they need.
Think about it, anyone who can dead lift 400+ lbs, squat 300+ lbs, for Reps MUST have a nice big strong heart and nice strong flexible blood vessels.
About the only thing cardio is good for as it is used by the most of you cutting, i.e., 45 minute cardio sessions, is to burn extra calories whihc you may ingest during the day. Your not burning much, if any, stored fat if you do a 45minute cardio and take in enough calories to support even the most mininmal amount of anabolic activity.