> If the goal is just to provide resistance against breathing, wouldn't it work just as well to suck air through
There's something a lot of people (including myself) do which sounds a lot like Darth Vader, which is to cup your open mouth and breathe in while getting stressed about things.
You probably don't need a device at all to do breathing exercises (like a kapalbhati in Hindu tantric traditions, though the whole exercise involves stuff you need a tub for).
The electronic device is probably better for a medical setting , because it will not just measure, it will track the activity in some way - the numbers matter because the medical practice is evidence based in a good way, the goal being to titrate a dosage, even for exercise interventions.
There's something a lot of people (including myself) do which sounds a lot like Darth Vader, which is to cup your open mouth and breathe in while getting stressed about things.
You probably don't need a device at all to do breathing exercises (like a kapalbhati in Hindu tantric traditions, though the whole exercise involves stuff you need a tub for).
The electronic device is probably better for a medical setting , because it will not just measure, it will track the activity in some way - the numbers matter because the medical practice is evidence based in a good way, the goal being to titrate a dosage, even for exercise interventions.