Pavan Muktasana....

Lie down on back with feet close together. Keep hands on side of the body with palms facing down.
Inhale, raise both the legs to 90 degrees and then bend both the legs at the knees. Make a finger lock with hands and place just below the knees. Simultaneously raise the head and shoulders and bring the
nose in between the knees.   Bring thighs close to the chest. While exhaling return to the original position. Repeat this exercise three to five times.

Benefits
This is gas releasing pose. It releases excess gas from the abdomen. Those who suffers from
constipation must do this exercise after drinking a glass of lukewarm water for proper evacuation
of bowels.
This exercise strengthens the abdominal muscles, liver, spleen, pancreas and stomach.