keep fit

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˌkeep ˈfit noun [uncountable]  British English old-fashionedEXERCISE a class in which you do exercises to keep yourself healthy 健身(课) → aerobics —keep-fit adjective

ˌkeep ˈfit nounChineseSyllable  

keep fit
ˌkeep ˈfit noun [uncountable]
British English old-fashioned a class in which you do exercises to keep yourself healthy ⇨ aerobics
—keep-fit adjective