Physical postures

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.

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). Some traditions suggest being barefoot, for comfort, for convenience, or for spiritual reasons.

Other traditions, such as those related to kundalini yoga, take a less formal approach. While the basic practice in these traditions is also to sit still quietly in a traditional posture, they emphasize the possibility of kriyas - spontaneous yogic postures, or perhaps repetitive physical movements such as swaying etc., which may naturally arise as the practitioner sits in meditation, and which should not be resisted but rather allowed to express themselves in order to enhance the natural flow of energy through the body, which is said to help purify the nadis and ultimately deepen one's meditative practice.

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. Practitioners of the Soto Zen tradition 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".