夢想於漆黑裡仍然鏗鏘 (arwingg)

Race #13

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Official speed 54.07 wpm (75.24 seconds elapsed during race)
Race Start February 20, 2017 8:14:56am UTC
Race Finish February 20, 2017 8:16:11am UTC
Outcome No win (4 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.