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English definition of “cardio”

cardio

noun [U] uk   /ˈkɑː.di.əʊ/ us    /ˈkɑːr.di.oʊ/ informal
physical exercise that increases the rate at which your heart works: My workout usually includes 15 to 20 minutes of cardio. cardio exercises/training/workouts
(Definition of cardio noun from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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