When sitting, just feel that you have become weightless, there is no weight. You will feel that somewhere or other there is weight, but go on feeling the weightlessness. It comes. A moment comes when you feel that you are weightless, that there is no weight. When there is no weight you are no more a body, because the weight is of the body – not of you. You are weightless.
You have to dehypnotize yourself. This is the hypnosis, the belief that 'I am a body and that is why I feel weight.' If you can dehypnotize yourself into realizing that you are not a body, you will not feel weight. And when you do not feel weight you are beyond mind.
The technique of siddhasan, the way Buddha sits, is the best way to be weightless. Sit on the earth – not on any chair or anything, but just on the floor. Sitting in a Buddha posture, locked – your legs are locked, your hands are locked – helps, because then your inner electricity becomes a circuit. Let your spine be straight. Now you can understand why so much emphasis has been given to a straight spine, because with a straight spine less and less area is covered, so gravity affects you less.
With closed eyes, balance yourself completely, center yourself. Lean to the right and feel the gravity; lean to the left and feel the gravity; lean forward and feel the gravity; lean backward and feel the gravity. Then find the center where the least pull of gravity is felt, the least weight is felt, and remain there. Then forget the body and feel that you are not weight – you are weightless. Then go on feeling this weightlessness. Suddenly you become weightless; suddenly you are not the body; suddenly you are in a different world of body-lessness.
Weightlessness is body-lessness. Then you transcend mind also. Mind is also part of the body, part of matter. Matter has weight; you do not have any weight. This is the basis of this technique.
Osho,The Book of Secrets, Talk #7