Katie (progress_2009)

Race #2077

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Official speed 55.67 wpm (73.07 seconds elapsed during race)
Race Start November 20, 2009 10:00:45am UTC
Race Finish November 20, 2009 10:01:58am UTC
Outcome No win (2 of 4)
Points 0.00
Text #408 (Length: 339 characters)

There are two kinds of fibers in our muscles, red and white. When an athlete trains for long distance running, he or she builds more red muscle fibers than white muscle fibers in his calf muscles. A sprinter has more white muscles. If you retrain a marathon runner to be a sprinter, most of the muscle fibers will convert to white muscles.