My performance on the slopes of Sonora Peak was underwhelming. I was breathing hard and felt sapped of vitality, which did not bode well for the more ambitious hikes I’d planned to undertake during the last two weeks of summer. At first I blamed the altitude, or the extended period of missed meals I endured at the Burning Man Festival. But then I finally remembered … Oh yeah … I’m sick. I sniffled a little extra to remind myself of that fact, then continued up the mountain at a less punishing pace.