I agree, I have noticed sufficient "cardiovascular endurance" gains from lifting intense weights (intense refers to elevating your heart rate for breif periods, repeated). on that note, I do not think interval training is completely useless. It can be good to lower body fat, and also has a place in generally preparing your body for intense lifting, especially with the legs. I only do "distance runs" (no more than 3 miles usually, only once a week) because I am in the Army, and tested on a 2 mile run.
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