https://youtu.be/OwQBBaihQ88
1) Lower your drag factor.
2) Row at a high rate (around 26)
3) If you need to breathe out your mouth - stop rowing. When you're ok - start rowing and nasal breathing again
4) Stop as many times as you need, but it may be helpful to reduce your intensity. I did this one at 2K+21 pace at 26spm.
The theory being that this builds CO2 tolerance, which then makes the oxygen / CO2 transfer more efficient. While also generating Nitric Oxide (which only happens through nasal breathing weirdly) which dilates your blood vessels, helping blood to circulate.
Intrigued whether anyone else has tried this, and has any thoughts. I was quite surprised at how easy it was.
John
![Image](https://i.ibb.co/C5srtGb/Thumb-1.jpg)