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Most people have never heard the term CO2 tolerance, let alone consider how it affects their health. We breathe in oxygen, breathe out carbon dioxide, and repeat. Simple, right? Not quite. CO2, or carbon dioxide, often gets a bad reputation as the waste product of breathing. But in reality, it's one of the most important elements in how your body uses oxygen. If you've ever felt out of breath during exercise, anxious for no reason, or constantly tired despite good sleep, ther

Most people think of breathing as something that just happens. It’s automatic. We don’t have to think about it, so we usually don’t. But...