Odd that after six months, my respiratory condition seems to be returning. Not as seriously as it was earlier this year, but still noticeable. Regardless, I met Sully for another workout this morning though I didn't say anything to him about it. I was breathing hard only after a couple of stations and I was considering calling it quits already. Then it felt like I hit a figurative wall... and I could breathe again! Finished my session with no further difficulty.
Hard to say what's going on internally. One possibility is that there is an unknown allergen that makes contact with me twice a year. Another is that my lifestyle is too sedentary and that unless I'm actually exerting myself physically, my body has decided to cut down my air intake in case I pass out from inhaling too much oxygen.
I hope it's the second option. At least I can do something about that.