Correct gesture for back swing is that the right upper arm's inside should be close to right armpit, while right elbow shapes an inverse triangle with unbend left arm.
正确的上挥杆姿势是右手上臂内侧应该紧贴右臂腋窝，右臂手肘与伸直的左臂呈一个倒三角形。然而一些球手在上杆的时候右臂向上抬起而并非紧贴身体。
The result shows: back-swing style has obvious advantages not only in the stage of set preparatory, set-off and flight but in diving moment and underwater slide.
研究结果表明，后摆蹲踞式出发技术不仅在预备姿势、起跳、腾空等阶段有利因素较多，而且在入水及水下滑行阶段更具有明显的优势。
The result shows: back-swing style has obvious advantages not only in the stage of set preparatory, set-off and flight but in diving moment and underwater slide.
研究结果表明，后摆蹲踞式出发技术不仅在预备姿势、起跳、腾空等阶段有利因素较多，而且在入水及水下滑行阶段更具有明显的优势。
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