Our Paced Breath Animations help you regulate your nervous system, lower your heart rate, and build your lung capacity over time (also referred to as increasing CO2 tolerance). ​Each video increases in exhale length. Start with the first video and use it for a week before moving on to the second video. It takes some practice to increase CO2 tolerance, so it’s best to work up to increasingly longer breaths. If you are interested in learning more about why we do paced breathing, make sure to read the text below.