In order to take your endurance training to the next level, you need to work on your breathing. The Bas Rutten O2Trainer can help. It is a respiratory training device that increases your lung function. It controls your air intake and helps strengthen your lungs, increase your stamina, and speed up recovery.
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The O2 Trainer helps promote better breathing habits. It could even be helpful for asthma and other respiratory issues. It comes with resistance caps from 1mm to 14mm to restrict airflow.
How to , and Why you Should do the Breathing Exercise as we show it
[where to find it][official site]
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