The word "body-building" refers to the process of building and strengthening muscles through weightlifting exercises. However, there are several antonyms that describe the opposite of body-building activities. Some of these include activities that involve minimal physical exertion, such as lounging or sitting still. Other antonyms may include words like "overindulgence," "laziness," or "inactivity." These words might describe actions that lead to physical deterioration and weaknesses, rather than strength and development. Furthermore, antonyms like "shrinking," "losing mass," or "wasting away" may describe the effects of shifting away from body-building activities. Overall, antonyms for body-building describe a lack of effort and neglect towards one's physical fitness.