○  TED英语演讲稿：无所畏惧 学无止境  ○

ew rules of swimming, if any of you are afraid of swimming, or not good at it. The first is, forget about kicking. Very counterintuitive. So it turns out that propulsion isn't really the problem. Kicking harder doesn't solve the problem because the average swimmer only transfers about three percent of their energy expenditure into forward motion. The problem is hydrodynamics. So what you want to focus on instead is allowing your lower body to draft behind your upper body, much like a small car behind a big car on the highway. And you do that by maintaining a horizontal body position. The only way you can do that is to not swim on top of the water. The body is denser than water. 95 percent of it would be, at least, submerged naturally.

　　So you end up, number three, not swimming, in the case of freestyle, on your stomach, as many people think, reaching on top of the water. But actually rotating from streamlined right to streamlined left, maintaining that fuselage position as long as possible. So let's look at some examples. This is Terry. And you can see that he's extending his right arm below his head and far in front. And so his entire body really is underwater. The arm is extended below the head. The head is held in line with the spine, so that you use strategic water pressure to raise your legs up -- very important, especially for people with lower body fat. Here is an example of the stroke. So you don't kick. But you do use a small flick. You can see this is the left extension. Then you see his left leg. Small flick, and the only purpose of that is to rotate his hips so he can get to the opposite side. And the entry point for his right hand -- notice this, he's not reaching in front and catching the water. Rather, he is entering the water at a 45-degree angle with his forearm, and then propelling himself by streamlining -- very important. Incorrect, above, which is what almost every swimming coach will teach you. Not their fault,

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