※ [本文轉錄自 not 信箱] 作者: [email protected] ([email protected]) 標題: [fuck] 誰來幫我翻譯一下 時間: Sun Apr 23 13:44:23 2006 作者: crazyabout (荔枝) 看板: telmeaboutit 標題: [fuck] 誰來幫我翻譯一下 時間: Sat Apr 22 22:03:41 2006 卡爾給我的講義 THE NEAT STUFF A powerful forehand uses the arm in much the same way an overhand throw does. Again, apply what you already know to your tennis game. A weak throwing motion keeps the arm and wrist rigid, or fixed, and lacks pronation (more on that follows later); an inconsistent throwing motion finds the arm and wrist flimsy like a pancake, or rubbery. The big not-so-secret secret from throwing overhand lies in the relationship of the forearm to the biceps. Say you're holding a baseball and you want to throw it. You hold the ball up by your ear, turn your shoulders, and your elbow is "back." Your arm is in a crooked position. To throw the ball the elbow drops and comes forward, your hand with the ball lays back and the biceps moves forward ahead of the hand and forearm. As in the example above using the clock face to swing your hand and forearm over to the 2 o'clock position, the forearm first swings back behind the elbow and biceps that are going forward. Then, like a spring, the forearm reverses this direction to complete the throwing motion, catapulting forward past the elbow and biceps. This motion is no different for tennis. Let me explain. Photo sequence 8B below illustrates how to do this, it illustrates the missing pieces in all photographic analyses of tennis forehands. Photo 8B1 starts the sequence with the arm in a crooked position for your backswing, what you always see by itself. 8B2 drops the elbow down toward the court below you, as in the throwing motion, freeing the forearm to take the racket fully back behind you, and it lays the wrist back. Again, you're used to seeing this single photo by itself (Stan and Steffi above). Now for the missing link. The elbow slides forward and gets in front of the hip (actually in between photos 8B3 and 8B4 but shown in 8C3 below). This leaves the biceps not straight up and down but angled forward, 8C3. The elbow and biceps stop their movement, 8B4 - 8B5, to allow the forearm and hand to catapult the the strings into the ball. The 8B sequence uses the arm in the same way an overhand throwing motion does. The elbow drops and comes forward first, allowing the forearm to swing back behind it and the biceps, which then allows the forearm to re-spring forward past them both. This is the key ingredient in all top forehands, and what's missing in everyone else's. The teaching term "keep the elbow in" is often the reason this key ingredient is lacking in so many forehands, it keeps the elbow just behind the body or to the outside of the back hip instead of allowing the elbow to slide forward. This term is accurate, the elbow is "in" close to the body, but the elbow is also fluid, it shouldn't remain behind the body because it'll keep the arm crooked throughout the forward swing as in 8A above. Photo 8C better shows how the elbow drops, slides forward, gets in front, or ahead, of the back hip, then stops to help accelerate the forearm, hand, and racket forward. Illustration 8D mimics 8C in stick form. The upper arrow in the first frame shows the forearm will be arching back, the lower arrow shows the elbow will lower. The curved arrow in the second frame shows the (slight) rotation of the back shoulder to help boost and support the arm's intended acceleration (of the racket), the bottom arrow that the elbow will slide forward. The curved arrow in the third frame shows the hand and forearm "throwing" laterally around the body while the elbow remains still. This third frame represents the crowning achievement in racket acceleration. --

※ 發信站: 批踢踢兔(ptt2.cc) ◆ From: 210.64.60.232 --

※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.119.133.8