: Why do I consume so much air? I am a volunteer firefighter and once every year we have to pass a fitness test to prove we are physically capable of working as a firefighter. One part of this test is to do a sport program

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Why do I consume so much air?
I am a volunteer firefighter and once every year we have to pass a fitness test to prove we are physically capable of working as a firefighter.
One part of this test is to do a sport program with a self-contained breathing apparatus (SCBA).

Now what I've noticed is that I need a lot more air than my colleagues, while I am quite fit: I exercise around 4-5h a week, divided into equal parts of cardio and weight-lifting.

Yet I need more air than slightly overweight smokers who only sparely exercise.
Is there any technique or training method maybe divers use to minimize their air-consumption?
(I am not quite sure which tags to use, so feel free to add or remove)

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