Funny thing about ballet dancers: Even when they’re being “funny,” they’re always a little preoccupied with whipping themselves, and others, into ever better shape. Ha ha ha. Sit up straight.

Lately, OBT is extending its good humor and good graces to the cubicle-bound class, offering advice on how you—an ordinary slouch—can improve your posture, musculature, and epaulement in just a few simple moves. With the trademark cheesiness and off-kilter pacing that typically accompany office instructional films, Gavin Larsen (whom many local dancers consider a great maven of technique) plays the “Sassyplum Fairy,” demonstrating ballet positions that you—yes, even you—can do.

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