Dhanurasana, the bow pose, is eighth in the sequence of 12 basic postures of hatha yoga. It is also the third, and last, of the three back-strengthening exercises included in a normal hatha yoga class. The main benefit of the bow is to give a full backward bend to the entire length of the spine, building both strength and flexibility in the back, bending the back in the opposite direction of the seated forward bend. Like the other back-strengthening exercises, the resting posture before the bow is done by laying on the stomach instead of the back.
Benefits :
Increases strength and flexibility along the entire length of the spine
Stretches the neck, shoulders, arms and legs
Combines the benefits of the cobra and the locust postures
Massages the digestive organs, relieving constipation
Improves digestion.

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