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How he says to do it
The Gnostic student can practice meditation seated in the Western or Oriental style. It is advisable to practice with eyes closed to avoid the distractions of the exterior world. It is also convenient to relax the body carefully, avoiding any muscle remaining in tension.
Christmas Messages, 1952–66 · read it in The Science of Meditation
Without mental force it is impossible to achieve the crystallization of a project (commercial, etc.). It is necessary for our students to learn how to handle mental force; but first it is necessary for the student to learn how to relax his physical body. It is indispensable to know how to relax the body to achieve the perfect concentration of thought. We can relax the body seated in a comfortable chair or lying down in the corpse posture (in decubito dorsal, that is to say on our back, mouth up, with our heels touching each other and our arms at our sides). The second of the two positions is better. Imagine that your feet are subtle, that a group of dwarves escape from them. Imagine that your calves are full of small playful dwarves that leave one by one and that, as they leave, the muscles become flexible and elastic. Continue with your knees, performing the same exercise. Continue with the thighs, sexual organs, abdomen, heart, throat, face and head muscles, successively, imagining that those small dwarves flee from each of those parts of the body leaving the muscles completely relaxed.
Introduction to Gnosis, 1961 · ch. 2 · read it in The Science of Meditation
It is necessary to try to totally relax all the muscles of the body and then concentrate Attention on the tip of the nose, until we fully feel the heart pulse in that organ of smell, then we will continue with the right ear until we feel the heart pulse in the latter, then we will continue with the right hand, right foot, left foot, left hand, left ear and nose once again, fully feeling the heart pulse separately in each of these organs where we have focused the Attention.
Esoteric Treatise of Hermetic Astrology, 1967 · read it in The Science of Meditation
Why
J.- It is indispensable to relax the body for the meditation, no muscle must remain with tension. It is urgent to provoke and to regulate drowsiness by will.
Runic Magic, 1969 · ch. 20, The Ten Rules for Meditation · read it in The Science of Meditation
Mystery of the Fire