s*****s 发帖数: 6 | 1 仔细看了一下,文章发的确实不错,尤其是chen hongyu的组,带着膜拜的心情看了一
下他们的研究方向,发现和本人的研究方向比较相似,然后就拜读了他的一些文章。重
点读了那篇被highlight两次的文章(J. AM. CHEM. SOC. 2010, 132, 11920–11922)
。然而,笔者发现有些内容还是值得商榷的。
这篇文章是关于具有机械性能的纳米弹簧(Mechanical Nanosprings),利用聚合物的
形貌变化来Coiling and Uncoiling 超细纳米金线,从而可以储存和释放机械能。在
abstract中,作者提到“The mechanical energy stored in this process can be
released upon removal or swelling of the polymer shells.”然而文中没有任何证
据证实mechanical energy的存在,这种说法毫无根据。本人这个想象有可能是错的,我将
会详细探讨一下这个机理以及简单的提及其他的相关机理。
总体而言,作者采用在DMF/THF/H2O的混合... 阅读全帖 |
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b*********s 发帖数: 6757 | 2 总体不错,抛球可以在往右往前偏些,感觉力量没充分爆发出去。
身体uncoil太早,不过这可能和抛球位置有关,不uncoil就没法打了,早uncoil了又没
法加力了, 所以说先改抛球。 |
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b*********s 发帖数: 6757 | 3 其实动作本身单反和双反差异不那么大, shoulder turn, load on the left (righty
) foot, step forward, anchor and extend through the ball etc. 双反力发于
coil和uncoil, 单反力出于weight transfer. 这也是为什么双反打open stance 容易
, open stance 你照样可以coil/uncoil, open stance weight transfer很难, 很少
看到pro打open stance 单反, 感觉打出来也是被对手杀。 我觉得这也为什么单反打
on the run 比双反容易, 跑动时weight transfer不难, 向前跑同时coil/uncoil 不
容易。
western grip is ok too (personally I don't recommend it if you are just
starting learning SHBH), Richard Gasquet's BH is more toward west... 阅读全帖 |
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b*********s 发帖数: 6757 | 4 lz 发球跳得真高, 爆发力强啊。 我也开始向这个方向发展了, 希望年底能达到lz的
这个弹跳。 总体不错的, 发力挺舒畅。
"确实不太清楚怎么用core power, 是指转体么?"
picture worth a thousand words :)
这张snapshot是你击球前,注意到你的胸和网基本平行==> 身体已经uncoil ==> 身体
coil/uncoil(core power)已经没了, 无法再transfer 到发球上。。。
另外一点是, 一般情况下这个步骤, racquet 该是on edge. racquet frame 该对着
球而不是拍面。
还有点是你这个发球给我的感觉是你人已经向下落时才击到球的, 应该是当你人还在
向上时击球。 (i could be wrong on this, yours is very close, hard to tell
without enough frames)
basically these are just ID issues. Couple actions you can consider to try (
no n... 阅读全帖 |
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l******o 发帖数: 301 | 5 我从开始打网球就受菲菲的影响,一直都是单反动作派,且打算一条路走到黑。平时在
家也会每周一两次shadow swing,感觉帮助还是很大的。但个人觉得动作要先做对,找
到两三个关键点,从慢到快,最后在追求动作的连贯性。看了你的视频,感觉你的连贯
性很好,很smooth,但动作不到位。
一些问题:
1. 握拍有问题。虽然看不清楚,但拍面明显是大陆式,打平击的方式,握拍需要至少
转一个棱。你的手腕动作太多,我个人觉得应该保持一种放松但crocked的状态,这样
有利保持手臂和球拍的角度,不至于需要muscle球。
2. Finish的位置不对。由于角度的问题,总感觉你的finish手臂水平。要想打上旋,
最基本的动作是由下到上,只有finish的高才能出spin。对于这点,你的正手问题更大
,每次都是在左边腋下,不知道是什么原因。所有人都是finish到左边肩头的。
3. 发力的机制有问题。要想不受伤,就不能过度用手臂。力量应该是从转体来的,只
有在接触球的瞬间,才加上手臂和手腕的力量。而现在看到的,过多是甩胳膊。
一切建议:
1.最开始时不要追求从split开始,就想好要打什么stanc... 阅读全帖 |
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l******o 发帖数: 301 | 6 我从开始打网球就受菲菲的影响,一直都是单反动作派,且打算一条路走到黑。平时在
家也会每周一两次shadow swing,感觉帮助还是很大的。但个人觉得动作要先做对,找
到两三个关键点,从慢到快,最后在追求动作的连贯性。看了你的视频,感觉你的连贯
性很好,很smooth,但动作不到位。
一些问题:
1. 握拍有问题。虽然看不清楚,但拍面明显是大陆式,打平击的方式,握拍需要至少
转一个棱。你的手腕动作太多,我个人觉得应该保持一种放松但crocked的状态,这样
有利保持手臂和球拍的角度,不至于需要muscle球。
2. Finish的位置不对。由于角度的问题,总感觉你的finish手臂水平。要想打上旋,
最基本的动作是由下到上,只有finish的高才能出spin。对于这点,你的正手问题更大
,每次都是在左边腋下,不知道是什么原因。所有人都是finish到左边肩头的。
3. 发力的机制有问题。要想不受伤,就不能过度用手臂。力量应该是从转体来的,只
有在接触球的瞬间,才加上手臂和手腕的力量。而现在看到的,过多是甩胳膊。
一切建议:
1.最开始时不要追求从split开始,就想好要打什么stanc... 阅读全帖 |
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r******n 发帖数: 1665 | 7 就随便一说啊,为了包子呵呵
熊小姐应该还玩其他一些运动。天生的好步伐。这个恐怕是最难练的。Keep moving!
反手:
1 你是不是打反手inside out和down the line比cross court顺手?如果不是就算了。
如果是,就和我一个毛病,请邮件我。
2 注意把follow through做完整了。现在一套反手拳还没有打完,就开始第二套了呵呵。
3 打完了完整的一套反手拳要把身体转过来面对对手。并且把左脚转到左边来。这样还
可以帮助把身体重量压上去。左脚往右边蹬对球速不太有帮助。
4 脚步好像有些busy,头部保持的不稳。这和2/3有点儿关系
正手:
loading stage的转肩充分。但是在uncoil stage关闭步伐的左腿会影响你身体uncoil
和发力。你的正手发力链开始很好,然后就被左腿卡住了这个样子,然后就只好用胳膊
的力量了。
另外是你的手腕没有lay back。感觉就是从肩到拍头接近一条线的样子。可能你开始学
的是东方式正手?你现在的正手更接近传统的东方式正手,发力是从后往前推的linear
方式。
Wrist lay back的好处是迫使你再... 阅读全帖 |
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b*********s 发帖数: 6757 | 8 well said. =)
我从来没测过发球速度, 70~80s只是我的感觉,可能更慢也不一定。 和个朋友打,我
能回他一发的机率很低,基本来不几急,我问他发球大概多快,他说90多,100左右,
快的话105。我的发球明显比他的慢很多。
LZ 说“最快有90+。但是现在还是不能当作武器”, 我觉得初学时不该把一个stroke
当做自己的武器,越早摆脱这种思想越好 (cough* cough* thirtystand hope you
are reading this =P )。 我以前也是这种思想,现在还在suffer, 还在 unlearn 这
些坏习惯。要说赢球,其实是3个level:
level 1: win by consistent
-->如果LZ比赛时一发70%,一个比赛没有DF,这就是个weapon.
-->很多人藐视pusher, 觉得他们没有武器,其实consistency, tenacity, calm 就是
他们的武器
level 2: win by move opponent
level 3: win by reduce opponent's time
LZ 发... 阅读全帖 |
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n**u 发帖数: 768 | 9 The big guy has a nice BH. The big guy in the video also has excellent serve
. His FH made good use of legs. He did not fully turning/uncoil the body
rather rely more on the arms. But he has big arms. Their arm muscles are
big enough to memorize the swing motion and generate enough power, i.e. Asus
(he has a big FH without a lot turning/uncoiling).
Because of the big guys's athleticism (he runs like rabbit), his ceiling is
much higher than Lao3. However if he want to get better than 4.5+, he... 阅读全帖 |
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b*********s 发帖数: 6757 | 10 我来试试, 看看能否回答.
首先, 我认为发球最重要两点也是最难做到的两点就是"hold the coil"和"go up to
the ball". 什么左臂抛球后要保持久些, 看球, 右脚不要过左脚等等都是为了 "hold
the coil" as long as possible.
BSP (back scratch position) 是为了易于"go up to the ball" 和"hold the coil".
BSP时, 肘向天,小臂的挥动自然是向上. 向上了, coil 也就可以hold 久些. 如果没
有BSP, 肘很容易向前甩, 身体自然就会随着肘动-- uncoil too early (typical wsn
mistake, thus hard for many wsn do ytcw)
再回到肘要抬高的问题上. 如果肘没抬高,而是缩着贴近身体, 要达到BSP要更多的时间
, 这是球已经抛出手在向下落, 很可能没充分的时间来完成BSP, 或会感觉被rush了而
变tight. 这样很容易cut off 你自己的full swing motion, 造成un... 阅读全帖 |
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b*********s 发帖数: 6757 | 11 try point at the ball. It's true that if your left arm stays too
perpendicular to the body it will get in the way of your swing. Once take
back w/ left hand, extend your left arm forward a bit, say about 100~120
degree to the ball, use that to gauge your hitting plane. Hold here as long
as possible, once your right arm starts the swing and about to hit the ball,
it should naturally move out of way with your uncoil. Holding there is to
ensure you don't uncoil too early. |
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l*****n 发帖数: 41 | 12 Haha. that's very normal for kids. I think, for parents like us, we should
learn to relax and give up. After I do not care how my kid play tennis, my
life becomes much more enjoyable. I do not need to spend hours on court with
him. I can watch some show and have more rest.
As to your kid, my personal opinion, his backhand is good, having good unit
turn , then uncoil.
his forehand, to me, it is more of weight transfer issue, then is due to the
footwork. his backhand has the same issue. kid does n... 阅读全帖 |
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p******u 发帖数: 101 | 13 Great tips, thanks. I also find for a beginner, the biggest killer on tempo
is from b to c. you can't harsh it in. You have to take the time to build up
the power, either by uncoiling or by the gravity of club.
every |
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v*****r 发帖数: 2325 | 14 your distance?
at par with professional players. tiger woods average driving distance is
28x yards this year... let alone carry distance...
any tips on gaining more distance?
i found that gotta have feeling of whip to add more speed to club face... or
wrist hinge/unhinge, and arms uncoil... |
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a***x 发帖数: 398 | 15 击球稳定性的关键是要用身体打球(coil 和 uncoil, weight shifting),减少
hitting with arm and hand,越灵活的关节和肌肉越难保持一致性。
distance和挥杆速度关系很大,力量要看在downswing的那个阶段释放,加力的时机错
了,力量会帮倒忙。共勉。 |
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B*D 发帖数: 5016 | 16 In the debris-strewn mall, you cower in a corner, your only weapon a shard o
f glass. The footsteps of four marauders clatter past you. It takes you a m
oment to realize that they’ve forgotten about you. They’re chasing someon
e else now.
You peek around a shelf and see them tackle a dark-haired girl. Only months
ago, the worst things on her mind would have been the SATs and finding a dat
e for the prom. Now, as they tear at her clothes, she is screaming and jerki
ng around like a fish on a bo... 阅读全帖 |
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p****4 发帖数: 517 | 18 The most important thing about serve is eye on the ball and do not lower
your head before the contact.
"take something off" for the second serve is the biggest misperception. Put
on more spin is the right way to add more control to the second serve. Never
think in your mind that you are to doubt-fault. Try to picture where and
how the ball will land.
The power of serve comes not only from the swing of your arm. It originates
from the court surface when you uncoil the bent knees. Turning your tru |
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s*****k 发帖数: 1630 | 19 I read this article before but it makes a lot more sense this time. Faint, I
finally understand what a "11 clock" means.
"You don’t want to uncoil too soon by bringing your back leg around because
you would prematurely face the net. This would cause you to fall to your
left (right for lefties) and drain your shot of power and spin, not to
mention leave you off-balance and out of position for the next shot. "
I need to revisit this article whenever I struggle with the Kick.
Is it true that for a ... 阅读全帖 |
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s*****k 发帖数: 1630 | 20 动作流畅,甩鞭那下很好。。。但是只是手臂在发球,没有用上knee bend, core,
body weight, racket drop也不够。
“跳”起来是身体uncoiling自然带出来的动作,是结果。不是现在要刻意追求的动作
。 |
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d*g 发帖数: 16592 | 21 呵呵,close是指准备动作的coil,open是指uncoil,
我不想咬文嚼字。 |
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d*g 发帖数: 16592 | 22 我打open stance就被说是经常uncoil太早,contact point太靠前,所以balance不够
好。
关键timing怎么掌握,除了多练,还有什么技巧么?
feeling. |
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t*****i 发帖数: 2249 | 23 上身缺乏转体,没有用到躯干的力量,还是主要用手臂打球
---- Exactly. Very nice point. I have been just focused on how to use my arm
to keep things simple (since my form was a mess). From now on, I need to
use my whole body more.(Shoulder turn, weight loading, Coil and uncoil).
Thanks
转带动肩膀-〉带动-〉大臂-〉带动小臂-〉然后最后传到手腕掌握方向和力度的感觉 |
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t*****2 发帖数: 199 | 24 你问这个问题,就说明你的脚步的问题了。
侧身不是故意侧身,这样你的动作就 停滞了,估计你击球都是跑到位,停了,侧身击
球?
侧身一定要是靠脚步的跑动自然 侧身,或者 lock hip, 打 backhand, 只要一脚前
,一脚后,右脚 step in 不就自然 侧身了? 打 底线 inside out 我用交叉步,就
像roger 那样,自然侧身.
跑到位后,hip 自然lock, 就像上发条一样, 自然 coil, 然后 扭转 hip, uncoil,
发条,击球, 这样是个很流畅的过程。
还有, 眼睛死盯球。这点就算很多 4.0 的朋友都做的不好,能够看到击球的瞬间,
这样就算你击球位置不好,也可以把球击的很稳。我现在就一直在训练我 5岁的女儿
在家扔球 用杯子接球, eyes on the ball, follow the ball.
---------------------------------------------
高手展开说说。是一直侧着上身跑吗?还是跑到位后侧身右肩膀对球? |
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t*********r 发帖数: 630 | 25 The body must move in a synchronized motion so that the arms and body and
racket are moving in harmony and not against each other.
every component helps to generate power and spin.
good video to show the forehand winding and unwinding or coiling/uncoiling.
http://www.youtube.com/watch?v=_Oc7U5oJ6ps |
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t*********r 发帖数: 630 | 26 from body uncoiling/shoulder turning/arm pronation 综合的力量 |
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t****i 发帖数: 4225 | 27 我刚才理解错了,以为是说怎样把身体打开。
open stance说起来很简单,但精髓是load你的右腿,然后uncoil转体击球。击球前左
腿跨一步是以前的打法了,不是开放式。 |
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L*********n 发帖数: 185 | 28 未名的朋友们好,这个是我未名上的第一个帖子最近刚刚从UIUC毕业,有一个公司的
OFFER还迟迟没有发下来,最近又必须带父母去东海岸旅游,暂时不能继续找工作。看
到这么有不少球友喜欢打球,我也奉上我的经验教训,攒人品中(希望能顺利拿到OFFER
和USPTA P-1教练执照)。
------------------------------------------------------------------------
一个业余教练的历程
痛苦的打球生涯
不知不觉我已经和网球结缘12年了,最近马上从UIUC 毕业,找到一份儿工作,总算歇
口气,想写个回顾帖子希望广大网球爱好者能从我的经历中学到一些东西(特别是教训
)。
我是从小学6年级第一次接触网球,打过4~5个小时,觉得非常有力量感,很好玩。高中
时候由业余教练练过100个小时左右。大学考的很不理想,好在由于种种原因,平均每
天能练球3个小时,于是练了2年,打断过120根线左右(身体确实比较结实,以前破高
中运动会记录的时候做了90个俯卧撑每分钟)。这时候由于教练并不专业,很多动作练
得并不专业,特别是正手,学的是正西偏超西方,击... 阅读全帖 |
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L*********n 发帖数: 185 | 29 强行回身就是到位够早能够在击球时候把左右移动速度归零。简单地说就是想侧身往返
跑一样顶得住。但是有时球太快勉强才能够到就只能在不太减左右移动速度的情况下拧
转身体完成抽击。因此会飞出去,左腿会自然从前方交叉过右腿以右侧球为例子。
不管那种中正手都需要最后一步右腿内侧肌肉吃住力,完成cool and uncoil. 实际上
这些身法不会影响击球质量,上旋和平基比例只和挥拍轨迹有关。越陡转的成分越多。
但是超西旋转比例太高,同样水平速度消耗能量巨大,不推荐。
这样解释清楚了吗 |
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L*********n 发帖数: 185 | 30 未名的朋友们好,这个是我未名上的第一个帖子最近刚刚从UIUC毕业,有一个公司的
OFFER还迟迟没有发下来,最近又必须带父母去东海岸旅游,暂时不能继续找工作。看
到这么有不少球友喜欢打球,我也奉上我的经验教训,攒人品中(希望能顺利拿到OFFER
和USPTA P-1教练执照)。
------------------------------------------------------------------------
一个业余教练的历程
痛苦的打球生涯
不知不觉我已经和网球结缘12年了,最近马上从UIUC 毕业,找到一份儿工作,总算歇
口气,想写个回顾帖子希望广大网球爱好者能从我的经历中学到一些东西(特别是教训
)。
我是从小学6年级第一次接触网球,打过4~5个小时,觉得非常有力量感,很好玩。高中
时候由业余教练练过100个小时左右。大学考的很不理想,好在由于种种原因,平均每
天能练球3个小时,于是练了2年,打断过120根线左右(身体确实比较结实,以前破高
中运动会记录的时候做了90个俯卧撑每分钟)。这时候由于教练并不专业,很多动作练
得并不专业,特别是正手,学的是正西偏超西方,击... 阅读全帖 |
|
L*********n 发帖数: 185 | 31 强行回身就是到位够早能够在击球时候把左右移动速度归零。简单地说就是想侧身往返
跑一样顶得住。但是有时球太快勉强才能够到就只能在不太减左右移动速度的情况下拧
转身体完成抽击。因此会飞出去,左腿会自然从前方交叉过右腿以右侧球为例子。
不管那种中正手都需要最后一步右腿内侧肌肉吃住力,完成cool and uncoil. 实际上
这些身法不会影响击球质量,上旋和平基比例只和挥拍轨迹有关。越陡转的成分越多。
但是超西旋转比例太高,同样水平速度消耗能量巨大,不推荐。
这样解释清楚了吗 |
|
M***x 发帖数: 288 | 32 你的forehand有一个习惯是喜欢用右脚单脚支撑, 左腿悬空然后swing, 这样做有几点
不好:
1. 只用到了手臂的力量, 右腿->身体旋转的力量没有用上多少 (缺少heel-to-heel-,
load & unload)
2. 这样做的时候经常你的身体击球的瞬间会有点后仰, 然后头和上半身不steady, 导
致击球不稳定, 很多普通的rally你会打出界或是深度失去控制.
我也有这个问题, 尤其是被pull wide的时候, 所以我体会比较深.
解决的办法你其实自己也看出来了, 就是每个球都要做到kneebend和coil -> uncoil
your body, commit to your shot. Don't be lazy :) |
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b*********s 发帖数: 6757 | 33 其实我认大多数情况下,对于初学发球,pronation有些over-rated. pronation 可能
可以给你多那么几MPH, 但你也increase了你得TE/GE的机率。 而且球速本身不快,加
这么几MPH也不见得会给你得分增加多少机率。improve 其他方面比如落点,旋转或
balance 可能更能增加你得分的机率。当然,如果你只想爽一把,pronation该能给你
来BSO的机会。大多数WSN图的也就是“爽”吧!
以下是我认为学习发球的阶段。1 和2 最重要,也是开始该最多练习的。这两项是发球
的基础。
1。 抛球
2。 稳+smooth (with proper technique)
-->stay relax and loose
-->find you own ritual
-->smooth take back, racquet drop
-->stay balanced
-->shoulder turn (coil)
-->don't drop elbow
-->racquet on edge
-->keep your head up
-->don't drop... 阅读全帖 |
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b*********s 发帖数: 6757 | 34 Nice improvement, should be good enough for 4.0 if you can put it in
consistently. But I would agree with Lao-dao that you might want to "slow"
down a bit and get everything sort out in the upper body first, such as
racquet drop, core coil and uncoil etc. Get a good feel of every part of
your body and every frame of movement. When you achieve that, you won't have
fear of double faults.
“学的ff的动作, 他每个都跳”
that's a finish product. Did you see how he learn serves?
Pros do amazing things on TV, but th... 阅读全帖 |
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b*********s 发帖数: 6757 | 35 US open is the only slam that's still missing in his collection, so I won't
be surprised if he lower his priority on Wimbledon.
One interesting thing Becker mentioned is Nadal's backhand. He plants his
left foot more firmly thus his knee gets a lot more pressure. It seems Joker
has a better release of those pressure by uncoil. Nadal kinda pressures the
force to his knee then hop/jump up. Something us DHBH need to be careful
with. |
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b*********s 发帖数: 6757 | 36 sorry, I didn't meant harm by referring Gorden's strokes to WS. It was just
an impression I got from his exaggerated forward lean. It's like a WSN 偷窥
mm, especially on the backhand side... bad joke, my bad.
As far as flaws... It might not be flaws against us WSN, but I see some that
could be flaws at 5.0 level or higher. Like his bh preparation is very
stiff, this makes his bh more flat, and could cause his right arm to pull
more when under pressure. I think his exaggerated forward lean might c... 阅读全帖 |
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n**u 发帖数: 768 | 37 其实也不是肩膀用力, 上身其实是放松的,正手力量是来自于脚, 上身的转动(UNCOIL
),胳膊和身体的FOLLOW THROUGH.
呵呵,补过说起来容易作起来难那。 坏习惯不好改啊。 |
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n**u 发帖数: 768 | 38 Both played a little tight early. Dupont played good most of the rest of
the game except for the tie breaker. Dupont played a little too tentative
and stop hitting the ball on the rise in the tie breaker. Dupont's FH had
good placement and balanced power. But I'd like see more power from Dupont's
FH. I 'd like to see Dupont uncoiling the torso faster to give more power
to his FH. It is probably the personality. Dupont must be a good tempered
guy. Dupont should get angry before the game. H... 阅读全帖 |
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n**u 发帖数: 768 | 39 Very good point! Here is Pro and Cons of LJ's game:
Pro:
1. Very tough mentally and physically. Excellent footwork. 5.0+ defensively.
2. Solid FH makes good use of legs which generate good spin.
3. Stable BH slice has good depth and angle.
4. Excellent volley for single game. Attacking opponent's BH then volley is
LJ's main scoring weapon.
Cons (only for 4.5+++++++++++++++):
1. FH lack of turning/uncoiling of torso could not generate faster pace.
With the BH slice, the slower pace could n... 阅读全帖 |
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b*********s 发帖数: 6757 | 40 之前在哄娃睡觉,没elaborate.
在你弯膝,弹跳的情况下,richliu 说要把脚的力量用上去。换一个角度来说,你用了
脚力,可是没有transfer到你的发球上。
我说现在不要用脚力也是在你现在没法把脚的力量舒畅的转到发球上而论的。 你上身
小问题还有些,比如身体coil的不够,引拍还是交僵硬,uncoil的太早,身体没有
reach up而是载如场内等等。当然要学好发球有很多渠道。你不一定要按我说的步骤去
做。 我是这两年好好的从新学发球,我是以我自己经验而言。我以前自己也花了不少
时间练,弯膝,扭腰,coil, pronation 等等我都研究过,我现在的感受是当时的时间
基本是浪费了,真该找个好教练指点。(好教练不好找) |
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t*********d 发帖数: 3398 | 41 多谢你的肺腑良言, 你说的三个关键词, coil, uncoil,和reach up, 我都试图去
实现, 不过实际做起来真的很难。
估计没有捷径, 只能一点点练, 一点点调整。
虽然奔的录像上看, 和以前变化不大, 不过我个人感受, 发力要好一些。 但是你说
的三点, 一直提高不多。
我每录一次, 就拿cc的精华区录像来对比,怎么学, 都学不像。
再试试一段时间, 实在不行, 就练个二发算了。 |
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b*********s 发帖数: 6757 | 42 在此说明一下,我可没说要练coil, uncoil, reach up 等等。。。 有些comment是看
到你发球录像的反应,这些的确都是要学的,但不是我现在建议你学的。
CC发球是挺好的。可是为什么对比CC呢?论发球我认为最text book的是Feliciano
Lopez,是我看pro中发球最到位的。 |
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b*********s 发帖数: 6757 | 43 原因之一是uncoil 太早,还没 charge up, lift off, 身体就载进上了。 鼻涕的发球
明显的停顿是charge up, 这样才能lift off, 有upward motion.
发球重点不是向下扣杀,从某中角度看重点是向上reach...
pose |
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n**u 发帖数: 768 | 44 Only double? It makes a lot of sense now why your FH only hit the ball to
your opponent BH side. But there is no doubt you are still a 4.0 level
double player.
You hit too many FH "loopers" with the strong body you had. Especially
movement is not your best weapon with you leg injury. You could certainly
turning and uncoiling a little faster (like you BH side) and finish the
racket at shoulder high. I have no doubt you would have a killer FH with
your strength/power. |
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w*****e 发帖数: 309 | 45 今天晚上打球,强迫自己摆trophy pose, 就是抛球后蹲着等会, 然后最后再uncoil
发力, 效果显著!只有前面几个timing没搞好失误了,后面稳定性和力度都有提高。
估计power提高了20%, 成功率提高更多了,可能有50%!Ace 了四五个,发球得分无数
。感觉这第一次奔发球真是受益非浅。
在此表示感谢jjch, acc28 和黑导。真是自己瞎练几百个也不顶行家一句话。
大家不要斗嘴了,赶紧上录像吧! |
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F*****o 发帖数: 4012 | 46 这个太牛了,一句话顶这么大用啊。
如果是真的,应该写三张支票,发给他们吧,不用多,俺觉得 $20 一个人,应该查不
多吧?
uncoil
。 |
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j**h 发帖数: 480 | 47 恭喜恭喜,悟性真高,这么快就领悟了,真为你高兴。
uncoil
。 |
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a***8 发帖数: 2433 | 48 谢谢你的反馈和好消息,呵呵。你是好同学,很多来这儿问这问那的得了信息就消失了
,除了黑导那样的一直不厌其烦的回答问题,传道解惑,很多id就倦怠了,譬如本人,
呵呵。happy improving!
uncoil
。
[发表自未名空间手机版 - m.mitbbs.com] |
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n**u 发帖数: 768 | 50 open stance need turning/uncoiling the core which you are lack of!
That is how you could improve from 3.0 to 4.0! If you just used the arm,
your ceiling is 3.5+ at best. |
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