First off. At least here in the states if you are a competitive distance runner you run long distance to build up endurance. While you do periodic sprint training to help with actual muscle strength. Over ninety percent is spent on just distance running to help endurance. Boxers do the same thing when training here. Cardio by definition means extended periods of excercise which is much more effective for endurance then short burst excercises which are intended for strength.
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