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What is the criterion measure or gold standard of cardiorespiratory fitness?
a. Directly measured maximal oxygen uptake.
b. Time to complete a 1-mile run.
c. Number of 12-inch steps that can be completed in 3 minutes.
d. Heart rate at the conclusion of a 3-minute step test.
e. Maximal power output during a 30-second sprint on a bike ergometer.