Dhanurasana

Meaning: Dhanu – bow dhanurasana
The asana resembles shape of a bow

Procedure:
Lie flat on your stomach. Deeply inhale and exhaling, bend the knees. Stretch the arms at the back and hold teh ankles with respective hands. Inhaling, lift the legs and the head up. Look up and breathe for a few times. As you exhale, come down and while inahling, release the hands and lega and come back to normal lying posture.

Benefits:

The kidneys are massaged and excess fat around the abdomen is removed
The entire elementary canal is reconditioned
Affects the entire nervous system and improves concentration.
Improves respiration
Relieves chest ailments
Rejuvenates the spine
Enhanced blood circulation
Pancreas and andrenal glands are toned
Strengthens the pelvic region

Limitations

People suffering from hernia, colites , peptic or duodenal ulcers should not practise this
Patients of hypertension and heart disorders should also avoid it
Slip disc patients should not even attempt to do it
Ladies should not practise it during menstruation and pregnancy

Reference:
Holding the toes with the hand and pull them up to theears like drawing a bow is dhanurasana
– Hatha Yoga Pradipika