Some Like It Hotter

IT was 105 degrees — as hot as a typical steam room — at Pure Yoga on the Upper East Side on a recent Saturday, but for the 16 women already perspiring through a series of plié squats in a ballet-based barre method workout, it wasn’t blistering enough.

“We’re turning it up to 110 degrees by popular demand,” the instructor, Kate Albarelli, 31, announced in the sort of cheerful tone that would usually signal a time to rest. The women looked as delighted as if she’d given them one.

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