Crossword Genius

Exercise from a standing position and back, spreading arms and legs (7,4)

Ross

I believe the answer is:

jumping jack

(Other definitions for jumping jack that I've seen before include "catching sailor unawares?" , "Lively firework - jointed toy figure" , "Firework that springs about noisily" , "One might be let off" .)

I've seen this clue in The Guardian.
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