Fundive123
Contributor
Running and bike riding are also good, and can be fun, cardiovascular activities that can help along with practicing breathing techniques.
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Hyperventilation is no longer considered safe and is not taught,except by PADI. Free Divers are doing something called oxygen packing instead.
Hyperventilating has caused too many blackout deaths. The free divers have totally gone away from it, according to their forums and videos. I'd love to take a good class sometime.