10:29
The CO2 Exhale Test is the simplest way to measure your CO2 Tolerance. This is a common test used to see where you are on a day to day basis with holding and handling the stress of CO2 buildup in the body. It involves taking 5 breaths and releasing the last breath as slow as possible. I will do the counting and you do the breathing for your CO2 Score Your time stops when: You run out of air prior to holding the breath, You swallow, or You interrupt the exhale with an inhale.