Apnea Trainer

Hold your breath more than 3 minutes by this app

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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