Different spiritual traditions, and different teachers within those traditions, prescribe or suggest different physical postures for meditation. Most famous are the several cross-legged postures, including the Lotus Position. For example, the Dalai Lama recommends the Seven Points of Vairocana in which: 

the legs are crossed in either the Lotus Position (here called the vajra position) or the other way, "Indian" or "tailor" fashion (here called the bodhisattva position)

the eyes are kept open (thus affirming the world)

the back is kept straight (like "an arrow" or "a stack of coins")

the shoulders are kept even and relaxed

the gaze is kept at a medium level—too low and one becomes drowsy; too high and one becomes restless

the mouth is kept slightly open

the tongue touches the roof of the mouth

Many meditative traditions teach that the spine should be kept "straight" (i.e. that the meditator should not slouch). Often this is explained as a way of encouraging the circulation of what some call "spiritual energy," the "vital breath", the "life force" (Sanskrit prana, Chinese qi, Latin spiritus) or the Kundalini. In some traditions the meditator may sit on a chair, flat-footed (as in New Thought); sit on a stool (as in Orthodox Christianity); or walk in mindfulness (as in Theravada Buddhism). 

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Various hand-gestures or mudras may be prescribed. These can carry theological meaning or according to Yogic philosophy can actually affect consciousness. For example, a common Buddhist hand-position is with the right hand resting atop the left (like the Buddha's begging bowl), with the thumbs touching. 

Quiet is often held to be desirable, and some people use repetitive activities such as deep breathing, humming or chanting to help induce a meditative state. The Tibetan tradition described above is probably in the minority for recommending that the eyes remain open. Practitioners of the Soto Zen tradition also meditate with their eyes open, facing a wall, but most schools of meditation assume that the eyes will be closed or only half-open. 

Often such details are shared by more than one religion, even in cases where mutual influence seems unlikely. One example would be "navel-gazing," which is apparently attested within Eastern Orthodoxy as well as Chinese qigong practice. Another would be the practice of focusing on the breath, which is found in Orthodox Christianity, Sufism, and numerous Indic traditions. 

Sitting cross-legged (or upon one's knees) for extended periods when one is not sufficiently limber, can result in a range of ergonomic complaints called "meditator's knee". 

Common Postures 

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Seated posture

Person can use any chair, stool, bench, anything that has a horizontal top, so that he or she may sit on it. The person sits up, with their back straight, and holds their head and spine in alignment. They rest their hands comfortably on their knees or arms of chair. Their thighs should be parallel to the floor while the person's back does not lean against the back of the chair.

Cross legged posture

Person crosses legs while seated on the floor (and on a cushion, if it is more comfortable) and unless skilled at yoga, does not attempt to rest feet on their thighs (like Indian yogis do). The person sits upright, back straight, and with their head and spine in alignment. Hands may rest in any position.

Kneeling posture

Person kneels on the floor with their knees together, buttocks resting on their heels and toes almost touching. They keep their back straight, head and spine in alignment, and rest their hands on their thighs.

Lying down posture

This is the savasna, or the corpse posture in yoga. Person lies down on a carpet, and makes sure legs are straight but relaxed. Normally, it is seldom used because it mimics natural sleeping postures, making it very easy to fall asleep while trying to meditate. It is often regarded as more effective as a stress reducer rather than in the meditation process.

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