According to authorities in Hatha Yoga, this posture balance upside down has been formulated mainly with the goal of achieving inner harmony and union of conflicting as arterial and venous blood flow, afferent and nerve impulses efferent, positive and negative counterparts bioenergy and so with the help of gravity. In addition to having good overall impact on the body makes the mind alert.
Practice methods:
The starting position

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Lie on your back with your arms at the sides.
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Step
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Exhale, with the help of your hands slowly lift your foot as shown in the figure. Hold your body with your hands behind to support and maintain stability.
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breathe normally maintain this pose from a few seconds to 2 minutes depending on the skill and comfort level.
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posture Release
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While inhaling, gently lowering your hips using your hands to support and back to the starting position.
Limitations / Contraindications:
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Hypertension, heart disease
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gestation
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Respiratory disorders
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spinal disorders
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high myopia, glaucoma, a serious eye disorder
benefits:
Physical
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It regulates your blood flow.
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It stretches your neck, body and legs.
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It also relaxes your feet.
Therapeutic
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There is a favorable change because an increase in the exchange of blood in the upper body, especially the chest, neck, and head.
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Relief of congestion, through rapid drainage of venous blood in the abdomen and pelvis.
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There is a healthy effects of gravity.
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This benefits the various organs of the body above the waist, including the important endocrine gland.
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This helps in constipation, dyspepsia, headache, dizziness, neurasthenia, functional disorders of the eye, ear, nose and throat, general weakness and sexual abuse, and other similar diseases.
Psychological
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It helps to soothe and calm the mind.
involved muscles
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trunk flexors and wrist extensors
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Contraction of the flexors and extensors of the spinal column
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isometric contraction of the hip and knee joints
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Erector spine and neck extensor