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Shelly Kiefer
Kiefer Sports - PowerLung Retailer
...the training helped with adjustment to the altitude and making it over 2 16,000 ft. passes without too much difficulty.
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Klaus Mees
Professor, University in Munich
For myself, I'm still using PowerLung. For a successful ascent at extreme altitudes it is crucial to have not only a good physical condition but also an energy-efficient and strong breathing.
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