cardio Meaning in the Cambridge English Dictionary
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Meaning of “cardio” in the English Dictionary

"cardio" in British English

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cardionoun [U]

uk   /ˈkɑː.di.əʊ/  us   /ˈkɑːr.di.oʊ/ informal
physicalexercise that ​increases the ​rate at which ​yourheartworks: My ​workout usually ​includes 15 to 20 ​minutes of cardio. cardio ​exercises/​training/​workouts

cardio-prefix

uk   /kɑː.di.əʊ-/  us   /kɑːr.di.oʊ-/ (also cardi-)
of the ​heart: cardiovascular
(Definition of cardio from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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