[Matthew W]

Jack thank you sir, yes makes sense, perfect.  Yes and definitely trying to replicate as I’m doing mountain races (Ultra Tour Beaufortain 7k meters vert in 110k mid-July).

The only other quick follow-up is I’m 2 weeks out from race, do you still recommend to do them on stair-stepper vs uphill treadmill, I have both but wonder if its risky for fatigue doing stair stepper vs a slightly less muscle impact on uphill treadmill.  I don’t have enough vert outside my house to do on trail over next couple weeks – so gym it is!

Thanks again for all the great content.

[Matthew W]

Ok thank you Scott – I’ll keep trying in this low 150s range, definitely feel the breathing change right about then so it must be close.

[Matthew W]

I’d just second what’s being said here so would be interested in Scott’s (Evoke) take — I can run higher bpm in low 150’s and have Pa:Hr < 5% , in fact close to  1.0%.  However nose breathing is difficult to sustain for an entire hour or so.

So my added question to this: is nose breathing a requirement threshold for AeT?

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