If you want "to be in exceptional cardiovascular condition", go practice with the indoor track team. Go run back-to-back 400-meter sprints and find out how unexceptional your conditioning is. The bball players might cover three miles in a game, but some of that is walking, shuffling, jogging with some sprinting. I had the opportunity to play frosh bball at a high school on its way to a consecutive appearance in the state finals. We ran and ran and ran some more on the court during practice, but I didn't learn what "hitting the wall" was till competing in the 440 yd race during the outdoor track season. Only when you can maintain a strenuous effort over 400, 600, 800 meters, etc. should you consider yourself to be cardio-exceptional running-wise.