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In page Leg shaving:

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For sports such as cycling and swimming, men started shaving their legs around the turn of the 20th century.[citation needed] Most male swimmers, bicycle racers, and some male non-racers shave their legs regularly.[citation needed] The practice is most useful in long-distance swimming, where the effects of drag can cause a significant time difference in races over 400 meters. Other reasons cyclists shave include: faster healing and easier cleaning of road rash, less pain during leg massage[citation needed].