As a note: A drum corp or marching band (and without going into the complex workings of drum corps that they aren't a school band, so they are independant from anything other then themselves, they are different in name only) during a practice run through of their show, or at a competition, have the heartrate, O2, and metabolic rates on equal of a professional marathon runner in a extremely physically fit condition about halfway hrough a marathon. In simpler terms: We work just as, in not harder then marathon runners in their prime in the middle of a marathon. It's been scientifically proven by scientists at a college (I forget which one) and verified by an independant source. A marathon is 26 miles, correct? Half of which is 13 miles, You join a corp/band, you will feel like you run a marathon everyday almost, and it will feel so good, ad mbe worth it many times over, and you gain frinds for a lifetime.