Exercise 4 - Wrist Extension against surface With your arm held vertically, press your hand, palm up, on a firm surface, as shown in the photo.
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If, however, the pitch of the noise changes when you press your hand on the glass, you should use some insulating cellophane tape between the glass and the frame.
然而，如果球场的变化，当你按下隔音玻璃贵手，你应该用一些玻璃纸胶带绝缘玻璃和框之间。
With a press of a button, the object is attached to your hand, but stays at that fixed distance, turning your hand into a catapult.
按下一个按钮，物体就被附着在了手里，但是它在固定的距离，把手变成一个弹射器。
Then press your thighs back to perpendicular, turn your torso back to neutral, and touch the second hand to its foot.
然后施力于大腿回到垂直状态，调整躯干到自然状态，然后用另一支手接触另外一支脚。
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