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First you need a inspiratory muscle trainer device and nose clips/plugs. It's basically just a valve that can be tightened with a knob. You can get them on Amazon and whatnot.

The actual exercise just involves inhaling through the device, for a couple of minutes, and over the course of days/weeks/months working up to higher resistance levels. It's hard work, and it bugs me that it forces you to mouth-breathe, but it will strengthen the muscles.

The linked study does 30 inhalations per session.

Yea, thanks, I bought the device used in the study, wasn't sure if there was more to it.

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