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Its will increase your speed with about 0.003% if you swim, and if you had alot of hairs on the legs
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I used to swim competitively and I did the shaving ritual before competitions. Shaving really does reduce drag, and noticeably so. You can actually feel the difference. If you don't believe me, go here and read the abstracts to four experiments that were done to prove (successfully) that shaving reduces drag.
http://soloswims.com/shaving.htm
"It was concluded that there is indeed a physical benefit to shaving-down (most likely a reduction in body drag) and that the benefits are not solely due to a psychological response."
"Thus, it is concluded that the use of this procedure before major competitions provides a measurable physiological advantage for the swimmer."
"It is concluded that removing body hair reduces active drag, thereby decreasing the physiological cost of swimming."
"These data indicate that reduced training specifically improves swim power; however, removing exposed body hair after taper may additionally enhance performance capabilities by increasing distance per stroke."