Definitely helpful for asthma and may also be helpful for some forms of Sleep Apnea. Unfortunately there's lots of medical disinfo surrounding BBT for other conditions it couldn't possibly impact and highly exaggerated efficacy for the few conditions within the realm of being physically possible to effect.
People will really act like it's Hamon breathing and can cure anything... Nope, just helps reduce hyperventilation. Physically impossible for it to improve lung function or cure diabetes for example.
Isn't the minimum speed to be considered HSR over 200 km/h? Can't have shit in America.