Improve (concentrate_on_speed)

Race #552

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Official speed 75.32 wpm (54.01 seconds elapsed during race)
Race Start January 18, 2012 4:32:51am UTC
Race Finish January 18, 2012 4:33:45am UTC
Outcome No win (2 of 5)
Accuracy 95.0%
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.