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genezapharmateuticals
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puritysourcelabs
Research Chemical SciencesUGFREAKeudomestic
napsgeargenezapharmateuticals domestic-supplypuritysourcelabsResearch Chemical SciencesUGFREAKeudomestic

lung capacity improvements

Slow deep breathing and holding exercises can help increase the volume of air you can normally intake. Continued cardio can assist in building efficiency.
 
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You can buy some resistance apparatus to help with diaphragm strength on amazon. Check them out.

I am not sure, these things are good. This is not a hyperbaric chamber. Diving with a tube never did an endurance racing athlete, the tube is a restriction. Perhaps, a simple heavy cardio training can help much more. High altitude training is good for only three to four week.


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