Apnea Trainer
Hold your breath more than 3 minutes by this app
Screenshots
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Hunter's comment
Apnea trainer helps you to hold your breath for more than 3 minutes by "The Milesstones System"
It is based on yoga technique and it strengthens your diaphram muscles so you will fill your lungs with more oxygen and release more CO2.
When I checked users' reviews, I saw that, it works.
It costs 2.99 $
Link
https://apps.apple.com/us/app/apnea-trainer/id391269557
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