Agnisara Pranayama

Sit in Padmasana and keep the hands on the knees in a comfortable position. Close the eyes slightly and concentrate on the mind with normal breathing.
Exhale slow, deep and stable breathe. Stop the breathe outside, i.e., do Bahirmukh. Stretch both the hands straight and keep them on the knees with slight pressure. Contract and expand the stomach. Try to touch the navel deep inside the stomach.
Keep the stomach and hands normal before doing poorak i.e., inhale. Now take deep, stable and slow breathe.
This is one cycle of Agnisar pranayama. In one cycle contract and expand the stomach at least ten times. Increase the number to 30. In the beginning practice it for 5 times and then slowly increase is it up to 15 cycles. During winters you can practice it for 25 cycles. Breathe normally, rest for sometime and then do shavasana.