I almost forgot! Be sure to check out "Marathon Challenge" on your local PBS station tonight at 8pm (ET) or at http://www.pbs.org/wgbh/nova/.
I've been watching it for 13 minutes and have already learned more about VO2 max than I ever thought I would be able to comprehend.
Be sure to check it out -and if you would like to order a copy of the program, contact:
P.O. Box 2284
South Burlington, VT 05407