Athleisure lead-in to "lemon" (4)

I believe the answer is:

lulu

(Other definitions for lulu that I've seen before include "Exceptional thing (colloq.); Berg opera" , "Berg opera; outstanding thing (colloq.)" , "Outstanding person; singer" , "Attractive girl" , "wonderful thing" .)

I've seen this clue in The New York Times.

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