Hapkido Tanjun breathing.

Many styles of Hapkido engage in a type of deep, focused and meditative breathing know as Tan-Jun breathing. It is also sometimes spelled Tan-Jon breathing, Dan-Jun breathing, or Don-Jon breathing, depending on how the Korean letters are transliterated. In fact this type of breathing is also used in other Korean martial arts such as Kuk Sool Won and Tang Soo Do, and even in non-martial arts based meditative traditions like Sun-Do.