Afterwards some people will suffer such involuntary phenomena as trembling hands, their body moving up and down, and sudden shuddering. There's nothing mysterious about these effects from the movement of qi, and nothing to fear from them. You've just got to keep a natural frame of mind, and keep focusing on your movements.
練導引時，初學者很快就會有手指麻脹的氣感，之後有人會出現手掌抖動、身體上下擺盪或是突然渾身一顫等現象，這就是氣動，沒什麼神秘，也不必害怕，只要保持自然，把意念專注在動作上即可。