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Streamline (swimming)
Streamline form is a swimming technique that is used underwater in every stroke. At the start of a race or on a turn, streamline form is used, usually along with a dolphin kick or flutter kick, to create the least amount of resistance to help the swimmer propel as far as they can. Many factors contribute to the perfect streamline form and mastering this method increases a swimmer’s speed. Streamline is one of the key fundamentals to mastering any stroke.
==Technique==
The streamline position consists of a person placing hand over hand, fingers over fingers and raising their arms above their head so the biceps are tucked close to the ears. The belly is sucked back to decrease curvature of the spine in the lower back and the swimmer’s head is brought back to ensure that neck is in line with the spine 〔McIntyre, Erin E., and Noshir Langrana. “Velocity Profile in Streamline Swimming.” The Rutgers Scholar:An Electronic Bulletin of Undergraduate Research 5 (2003): n. pag. Web. 7 November 2011.〕 Pinching the shoulder blades together is helpful in aligning the spine to straighten out the back. Legs are straight and feet are pointed. In theory, a perfect, straight line will be made down the backside of a swimmer from their head to their feet. The body should be on a horizontal plane under the water, with the legs kicking straight from the thighs and hips, not the knees. A great deal of flexibility is usually needed to reach the goal of a perfect streamline, particularly flexibility of the shoulders. Kicking in the streamline position underwater can be substantially faster than swimming any of the other aquatic strokes, competitive or otherwise. For this reason, competitive swimmers often try to kick in a streamline position off a wall or the starting block for as long as they can be underwater before coming up for their first stroke. This is why many swimmers spend a lot of time perfecting the form and technique of streamline.
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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