Jackie (jackie8848)

Race #261

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Official speed 58.98 wpm (68.97 seconds elapsed during race)
Race Start May 3, 2013 10:46:56am UTC
Race Finish May 3, 2013 10:48:05am UTC
Outcome Win (1 of 3)
Accuracy 96.0%
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.