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I'm guessing nobody clicked through because it is on nytimes.com...
I read through it. Pretty intersting. Running up stairs combines High Intensity Training and squat.
It doesn't really provide the progressive weight increases of barbell squats, and doesn't work your back muscles and arms like a proper squat, but if you're only going to do one exercise (which is a stupid restriction, mind you), it's probably not a bad choice.