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I myself also make use of the Powerlung, which is basically a breath resistance device. It has helped me improve my overall breathing and to an extent, my static apnea times.
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A tip for anyone that doesn't have a powerlung; try inhaling and exhaling through either pursed lips or with your tongue pressed against the roof of your mouth or front teeth. You can create quite an effective resistance using these techniques, and whilst I doubt it is anywhere near as effective as a powerlung after a good number of rounds I can start to feel it in my chest.