The Buteyko Breathing Method is named after its founder Russian Doctor Konstantin Buteyko.
Dr. Buteyko discovered that people with respiratory disorders breath in excess of 20,000 breaths per day resulting in hidden hyperventilation. It leads to low levels of carbon dioxide responsible for balancing many bodily function.
Asthma is the body's defense mechanism against too great a loss of CO2.
Take Buteyko Test
STOPWATCH
Sit straight without crossing your legs and breathe comfortably and steady.
After an exhalation pinch your nose.
Hold your breath and start stopwatch.
When you feel a slight discomfort resume your breathing and note the time.
The interval you just measured is called "control pause". It reflects the tolerance of your body to carbon dioxide. Healthy individuals with normal breathing pattern are generally able to hold their breath for 40-60 seconds without any discomfort
Sit straight without crossing your legs and breathe comfortably and steady. 
After an exhalation pinch your nose. 
Hold your breath and start stopwatch.
When you feel a slight discomfort resume your breathing and note the time.
