duy (ngocduy235)

Race #1932

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Official speed 67.29 wpm (60.45 seconds elapsed during race)
Race Start April 10, 2013 11:27:03am UTC
Race Finish April 10, 2013 11:28:04am UTC
Outcome Win (1 of 5)
Accuracy 93.0%
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.