Another way to relax and restore natural breathing patterns is to practice forced breathing. Forced breathing involves consciously squeezing more air out of your lungs by using the muscles between your ribs.
Take a deep breath in through your nose — let it out through your mouth — and as you let it out, squeeze out more air, and more air, and more air, and even more air . . . squeeze it all out! Use your whole belly to continue to press out more air. Then, inhale.
Continue several rounds of forced breathing.