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5BX

noun

  1. a fitness exercise programme originally devised in the Canadian Air Force
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Word History and Origins

Origin of 5BX1

from 5 b ( asic ) ( e ) x ( ercises )

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