Diving Techniques under Sea
"Apnea Diver" is a fantastic app due to which we can learned techniques used in sea diving, just like improving & holding breathing skills.
This app works on strengthening the diaphragm muscles to help fill your lungs with more oxygen on inhalation and release as much carbon dioxide upon exhalation. The static tables also help to improve general athletic ability because it improves you lung capacity.
Source
Stop-watch to set maximum breath hold time
Auto and adjustable settings for exercise tables
Audio instructions
Log book to track progress
Ability to save custom settings
https://apps.apple.com/ie/app/apnea-diver/id924691089
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