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> You can't train above your ventilatory threshold while nose breathing

Why? What about this? http://www.journals.aiac.org.au/index.php/IJKSS/article/view...

Conclusion: This study supports the ability of recreational runners to utilize a nasally restricted breathing pattern at all levels of running intensity without loss in VO2max or GXT TE, and with superior PE and VE/VO2, following an extended training period using this practice.

I was a bit flippant, yes sometimes you have to breathe through the mouth but whenever possible one breathes through nose.

Hence the "sufficiently hard" qualification

His comment still does not make sense as a reply. I'll admit my response was poor as well.

Aerobic - with air.

Are you saying boxing is purely aerobic, or that anaerobic includes the word aerobic which means “with air”? I’m not picking up your intention either way. Boxing is a high intensity exercise which would at points be anaerobic.

Just being a little clever. It's both but boxing isn't a street fight, you do have short bursts but you still need to make it 12 rounds or less.