Exercise can act as a double edge sword where it can either incur stress or remove it depending on the quality of the breath. The best way to consistently breath into the lower lobes of the lungs is by nasal breathing. The nose is really an intricately designed breathing apparatus that will prepare the air perfectly for access into the lower lobes. In short the nose filters, moistens and rarifies the air so the penetrate the lower lobes.
Probably the most unusual feature lies in the turbinates of the nose, which act as turbines to swirl the air into vortices that drives the incoming air into the small and distal alveoli of the lungs. It is when these distal lobes are fully perfused that the body produces a neurological state of composure even while under extreme stress - thus the eye of the hurricane."...
He quotes tennis great Billie Jean King saying, ...“I would transport myself beyond the turmoil of the court to a place of total peace and calm."...