Linga Mudra 

The Linga Mudra is so called because it increases body heat by focusing on the element of fire inside the body. The thumb represents the element fire. This fire is reinforced by performing the linga mudra

How to perform:

This Mudra is performed by interlocking the palms, but keeping the left thumb erect, pointing upwards.

Effects:

It reduces weight by dissolving  the fat. Make sure you drink plenty of water as Linga Mudra generates heat in your body. Take milk, ghee, more water and fruit juices in addition to practice of this mudra for much benefits. If you're already obese with excess water in the body, then avoid drinking more.

Benefits:

The linga mudra can be used to overcome the following disorders:

Shivering and chills due to intolerance of cold weather; hypothermia.

Ailments caused by an overproduction  or accumulation of phlegm (mucous) in the body; such ailments include colds, sinusitis, productive (wet) cough, sticky stools, etc.,

Asthma and other respiratory ailments that occur at the change of weather, it Strengthens lungs.

Sexual debility in males.

Time Duration:

The Linga Mudra can be performed while standing up or seated.

Hold this posture for 15 minutes while inhaling and exhaling normally.

Practice it any time you want. But don't practice it a lot as it produces heat in the body.. It can cause sweating even in winter if you practice it longer. 

Duration:

This mudra is not to be performed on a regular basis, It should be performed only when needed (e.g., when suffering from chills) and should be discontinued once the ailment has been overcome.

Precautions:

Overuse of Linga mudra may aggravate the Pitta humor within the body, causing sluggishness and lethargy.

This mode should not be performed when suffering from ailments of Pitta-excess especially fever.