Shunya is a void or vacuum (Sunya, in Buddhism). Shunya Mudra is a hand motion that leaves one lobe of the lungs empty while others are expanded.
- Use this Mudra in conjunction with any of the other Prana Mudras.
- One palm should be open, with the thumb at a 90 degree angle to the palm.
- Place the palm of your hand on the leg closest to your torso, facing upward.
- Now take a big breath.... the portion of the lung on the side of the Shunya Mudra will not be activated.
- The other lobe of the lung indicated by the specific Mudra will inflate and deflate as the breath rises and falls.
The lobular portions of the lungs may be trained in this manner until they are completely under your control. You'll see why this is PRANAYAMA, or breath control, on its own.
You may also want to read more about Yoga here.
You may also want to read more about Yoga Asanas and Exercises here.