Osho talks about Kundalini Meditation:
"If you are doing the kundalini meditation, allow the shaking – don′t do it! Stand silently, feel it coming, and when your body starts a little trembling, help it, but don′t do it! Enjoy it, feel blissful about it, allow it, receive it, welcome it, but don′t will it."
"If you force, it will become an exercise, a bodily physical exercise. Then the shaking will be there, but just on the surface. It will not penetrate you. You will remain solid, stonelike, rocklike within. You will remain the manipulator, the doer, and the body will only be following. The body is not the question, you are the question.
"When I say shake, I mean your solidity, your rocklike being should shake to the very foundations, so it becomes liquid, fluid, melts, flows. And when the rocklike being becomes liquid your body will follow. Then there is no shaker, only shaking; then nobody is doing it, it is simply happening. Then the doer is not.
"Enjoy it, but don′t will it. And remember, whenever you will a thing you cannot enjoy it. They are reverse, opposites; they never meet. If you will a thing you cannot enjoy it, If you enjoy it you cannot will it."
Osho, The Book of Nothing: Hsin Hsin Ming, Chapter 2