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bodybuilding

or bod·y-build·ing, bod·y build·ing

[bod-ee-bil-ding]
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noun
  1. the act or practice of exercising, lifting weights, etc., so as to develop the muscles of the body.

Origin of bodybuilding

1900–05; from the verb phrase build (up one's) body; see -ing1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for body building

body building

noun
  1. the practice of performing regular exercises designed to make the muscles of the body conspicuous
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