pupu (lilylin520)

Race #4

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Official speed 36.76 wpm (110.66 seconds elapsed during race)
Race Start December 2, 2017 12:53:27pm UTC
Race Finish December 2, 2017 12:55:17pm UTC
Outcome Win (1 of 4)
Accuracy 95.0%
Points 37.98
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.