Hatha Yoga Pradīpikā II. 15: Just as a lion, elephant, or tiger is tamed gradually, the breath too should be brought under control [slowly]. Else it will harm the practitioner. [Krishnamacharya] If the breath is forced, it will result in chest pain and other aliments.
Lifetime Learning Institute Class "Yoga for the Third Stage of Life" beings September 13, 2021. Goto http://www.lliaustin.org for more information and to register.