The Lotus Position (Sanskrit: पद्मासन [pɐd̪mɑːs̪ɐn̪ɐ], IAST: padmāsana) is a cross-legged sitting asana originating in meditative practices of ancient India, in which the feet are placed on the opposing thighs. It is an established asana, commonly used for meditation, in the Hindu Yoga, Jain and Buddhist contemplative traditions. The asana is said to resemble a lotus, to encourage breathing proper to associated meditative practice, and to foster physical stability.
Padmāsana means "Lotus throne" and is also a term for actual thrones, often decorated with lotus foliage motifs, on which figures in art sit. In Balinese Hinduism, a prominent feature of temples is a special form of padmasana shrine, with empty thrones mounted on a column, for deities, especially Acintya.
In Chinese Buddhism, the lotus position is also called the "vajra position" (Skt. vajrāsana, Ch. 金剛座 jīngāngzuò). The traditions of Tibetan Buddhism also refer to the lotus position as the "vajra position." It is also practiced largely by Baba Ramdev in India.
From the common sitting down on the floor (Indian Style, Cross-legged) position (asana), one foot is placed on top of the opposite thigh with its sole facing upward and heel close to the abdomen. The other foot is then lifted up slowly and placed on the opposite thigh in a symmetrical way.
The knees are in contact with the ground. The torso is placed in balance and alignment such that the spinal column supports it with minimal muscular effort. The torso is centered above the hips. To relax the head and neck, the jaw is allowed to fall towards the neck and the back of the neck to lengthen. The shoulders move backwards and the ribcage lifts. The tongue rests on the roof of the mouth. The hands may rest on the knees in chin or jnana mudra. The arms are relaxed with the elbows slightly bent.
The eyes may be closed, the body relaxed, with awareness of the overall asana. Adjustments are made until balance and alignment are experienced. Alignment that creates relaxation is indicative of a suitable position for the asana. The asana should be natural and comfortable, without any sharp pains.
In most cases, a cushion (zafu) or mat (zabuton) is necessary in order to achieve this balance. One sits on the forward edge of the cushion or mat in order to incline one's pelvis forward, making it possible to center the spine and provide the necessary support. Only the most flexible people can achieve this asana without a support under their pelvis (and likewise does The Dalai Lama explicitly advise).
Other meditation asanas are indicated until sufficient flexibility has been developed to sit comfortably in the Lotus. Sciatica, sacral infections and weak or injured knees are contra-indications to attempting the asana.
The Lotus position is adopted to allow the body to be held completely steady for long periods of time. This allows the mind to calm—the first step towards meditation. The asana applies pressure to the lower spine which may facilitate relaxation. The breath can slow down, muscular tension decrease and blood pressure subside. The coccygeal and sacral nerves are toned as the normally large blood flow to the legs is redirected to the abdominal region, which may help to improve digestion. The practice of this asana leads to a straight spinal cord. It is observed that sitting in this posture good thoughts come to the mind and thoughts of anger and lust subside. The practice of this asana with repetition of Oum leads to reduction in stress. 
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- Padmāsana (पद्मासन) with detail explanation
- Detailed non-commercial article with references, updated 24.06.2006: 
- How to sit in Ardha Padmasana