[转贴]直腿打腿练习
<P><FONT size=5><STRONG>直腿打腿练习</STRONG></FONT></P><P><FONT size=5><STRONG>这个练习也有助于运动员在鞭状打腿中，纠正上打屈膝过度的错误。教练员应该向运动员讲授由髋部直腿打腿，但腿和踝关节要绝对放松。这种方式会使运动员在上打时，趋于保持直腿，但水会使腿在下打时自然地弯曲。<BR><BR>文字内容译自马格利索著《Swimming Fastest》一书。<BR></STRONG></FONT><BR><SPAN id=attach_12908 onmouseover="showMenu(this.id, 0, 1)" style="LEFT: 213px; POSITION: absolute; TOP: 656px"></SPAN> <IMG style="WIDTH: 8px; HEIGHT: 2px" height=20 src="http://www.51swim.com/mybbs/images/default/attachimg.gif" width=8 border=0><IMG onmouseover="attachimginfo(this, attach_12908, 1);attachimg(this, mouseover)" onmouseout="attachimginfo(this, attach_12908, 0, event)" alt="" src="http://www.51swim.com/mybbs/attachments/month_0802/20080209_6b213966e7d5a1619f6at2XefhLT6huo.gif" onload="attachimg(this, load)" border=0></P><P><FONT size=5><STRONG><FONT face=宋体>图片截自qwee所写《从棍子到鞭子</FONT><FONT face="Calibri ">-----</FONT><FONT face="宋体 ">关于自由泳打腿》一贴的</FONT><FONT face="宋体 ">打腿视频。</FONT><BR></STRONG></FONT></P> <P><FONT size=5><STRONG>何谓鞭打？鞭打就是肢体在克服阻力和自身位移的过程中，肢体诸环节依次加速和制动，使末端环节产生极大运动速度的动作形式。自由泳的两腿打水动作完全符合这样的鞭打动作概念，是由腰部发力，经过髋、膝、踝关节的动量传递，并且由躯干动作协调配合完成的。<BR><BR>请注意观察下面动画中，运动员转髋与打腿的关系。该动画截自《Freestyle-Timing the Kick》一文中的视频而成。<BR></STRONG></FONT><IMG onmouseover="attachimginfo(this, "attach_12923", 1);attachimg(this, "mouseover")" onmouseout="attachimginfo(this, "attach_12923", 0, event)" alt="" src="http://www.51swim.com/mybbs/attachments/month_0802/20080210_64d379db57e546e34b01x6EkdZLQi9m8.gif" onload="attachimg(this, "load")" border=0> <BR></P> <FONT size=5><STRONG>请看下面陆地上"扭胯"的动画。</STRONG></FONT><BR><BR><IMG onmouseover="attachimginfo(this, "attach_12983", 1);attachimg(this, "mouseover")" onmouseout="attachimginfo(this, "attach_12983", 0, event)" alt="" src="http://www.51swim.com/mybbs/attachments/month_0802/20080214_a31a2b0a8d4988032192Rl99hnz5vYPy.gif" onload="attachimg(this, "load")" border=0> 好贴 要弯曲有度，大概15度左右，再打直。要多练习，一定会有进步！努力吧朋友---------- 这样的游泳示范动作真好。学习了！
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