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A means to slowdown your exhale speed, breath slower and push the breath downwards to the belly (so Diaphragm get to work) for otherwise healthy persons.
If you have a medical condition linked to the respiratory system, you should of course talk to your doctor or physiotherapist before using these techniques.
For you who want to take your resistance breathing to next level or make the resistance a bit more exact there are good and cheap equipment to achieve this. Per,…