Wondering as well. Could they be incredible in some cardio sport because they could push themselves. Or would they push too hard? Or is the type of pain differe

Wondering as well. Could they be incredible in some cardio sport because they could push themselves. Or would they push too hard? Or is the type of pain different so they feel discomfort same as we do? What about holding your breath? The pain is from co2 in your lungs, not a lack of o2, so it is mostly your brain/will stopping you from holding it longer.