Is it just me?

I definately get out of breath sooner when it's 40-ish than when it's 60-ish.

Doesn't seem logical. Seems like the cooler air should have more O2 in it per
unit volume, for one.

OTOH, I'm not getting the same miles in as during warm weather.
OTOOH, I've been doing the StairMaster pretty regularly....

Seems like an annual occurrance.

Anybody else?
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PeteCresswell