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Race #513

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Official speed 174.17 wpm (23.36 seconds elapsed during race)
Race Start March 1, 2013 4:30:49am UTC
Race Finish March 1, 2013 4:31:13am UTC
Outcome Win (1 of 2)
Accuracy 100.0%
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.