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sidestroke
The sidestroke is a swimming stroke, so named because the swimmer lies on one's side with asymmetric arm and leg motion〔Lori Thein Brody and Paula Richley Geigle ''Aquatic Exercise for Rehabilitation and Training'' p. 153 ISBN 978-0-7360-7130-7〕 and it is helpful as a lifesaving technique and is often used for long-distance swimming.〔(Thomas, David G. ''Swimming: Steps to success'' p. 71 )〕 The sidestroke allows the swimmer increased endurance because, instead of working both arms and legs simultaneously in the same way, the side stroke uses them simultaneously but differently.〔 A swimmer tired of exercising one side can turn over and use the other, the change of action helping the limbs to recover.〔(Fredrick Warne & Co. ''Modern Outdoor Amusements'' pp. 18-19 )〕
The hands act like oars, and do not waste any power by oblique action. In ordinary swimming on the right side the left arm moves gently in the water, almost at rest.〔 Then, when the used arm when becoming tired, the swimmer turns on the other side, and the left arm works while the right arm rests.〔
== History ==
Sidestroke evolved in ancient times from swimmers who discovered that it was painful to swim breaststroke with the head above the water.〔 The head naturally turned onto its side, which led to the shoulder dropping. the scissor kick became natural in this situation.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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