Swimmers body has great effect on the generation of hydraulic resistance, so, body “deformed” has great
significance to swimming. In order to reduce hydraulic resistance and transfer segments acting force and change its
shape and rigid ability, swimmers make ups and downs motion in butterfly and breaststroke, their trunk can direct
make contribution to propulsion force; In free stroke and backwards stroke, trunk rotates along its vertical axis that
is helpful for swimmers to make use of huge powerful back, pectoral muscle groups so as to increase muscle tone
and fluid reverse acting force, this rotation is helpful for arms opposite direction recovery on water surface, and
decrease arms horizontal movements
Swimmers body has great effect on the generation of hydraulic resistance, so, body “deformed” has great
significance to swimming. In order to reduce hydraulic resistance and transfer segments acting force and change its
shape and rigid ability, swimmers make ups and downs motion in butterfly and breaststroke, their trunk can direct
make contribution to propulsion force; In free stroke and backwards stroke, trunk rotates along its vertical axis that
is helpful for swimmers to make use of huge powerful back, pectoral muscle groups so as to increase muscle tone
and fluid reverse acting force, this rotation is helpful for arms opposite direction recovery on water surface, and
decrease arms horizontal movements
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