Pavanamuktasana Asana 

In the wind removing pose also known as the Pavanamuktasana, the knees and the thighs are compressed together against the chest and the stomach in this asana. The stomach gas trapped in the large intestine gets expelled from the rectal region, as you do this asana. To do the Pavanamuktasana, or the wind removing pose -

Lay flat on the floor under a mat, and exhale. As you take a deep breath raise both the legs. Bend both the legs till the knees touch the stomach. As you maintain the bending posture, keep the knees and toes together. Allow the stomach to get pressed by the folded legs and thighs on top of it. Now clasp the folded knees with both your arms. Bend your neck and raise the head while fixing the chine between the knees. It is important that you keep the knees and thighs pressed together against the chest and stomach during this asana. But at the same time ensure that the calves are also pressed against the thighs so that when the arms grasp your legs, the sought after pressure can be felt on the stomach. The pressure will have the desired result from this asana.

Maintain this position for at least one minute. Now straighten out your neck and slowly bring your head on the floor. Unclasp your arms and lay them beside you. As you inhale straighten out the legs and while you exhale slowly bring the legs down lay them gently on the mat.