To do Bronchial Mudra you have to press the little finger at the base of the thumb, the ring finger on the upper thumb joint, and the middle finger on the pad of the thumb. The index finger will remain extended. It is a difficult mudra to hold. Take help of second person to fix your fingers at prescribed spots. Do it for 5 minutes thrice a day along with Asthma Mudra, which must be practiced for similar duration.