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DEENA KASTOR Marathon

VO2 Max): 82.0 ml/kg/min. (One of the highest ever recorded for women; 40 is considered high for an average woman her age.)

SHAWN CRAWFORD TRACK, 200 METERS

VO2 Max. Serious exercisers may use a VO2 max calculation, which measures the amount of oxygen consumed during intensive, all-out exercise. The most accurate testing method uses computers, but anyone can estimate V02 without instrumentation (with an accuracy of about 95%): After running at top pace for 15 minutes, round off the distance run to the nearest 25 meters. Divide that number by 15. Subtract 133. Multiply the total by 0.172, then add 33.3. Olympic and professional athletes train for VO2 max levels above 80. But for the average person interested in fitness, a VO2 max equaling between 50 and 80 is considered an excellent score for overall fitness.

Mr. Indurain's VO2 max, according to a widespread rumor, was 95 milliliters per kilogram of body weight per minute,

"Lance would be 60 if he was a couch potato and never trained," Dr. Coyle said. "For the average person, their ceiling is Lance's basement."

Mr. Armstrong's VO2 max is 85 milliliters of oxygen per kilogram of body weight per minute. An average untrained person has a VO2 max of 45 and with training can get it to 60.