cardio

1 of 2

adjective

car·dio ˈkär-dē-(ˌ)ō

: cardiovascular sense 2

cardio exercises

cardio

2 of 2

noun

: cardiovascular exercise

30 minutes of cardio daily

Examples of cardio in a Sentence

Recent Examples on the Web

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Adjective

Fredericson said the activity pushes the body into the cardio sweet spot of roughly 60 to 70 percent of max heart rate, and noted that research shows carrying heavy loads over complex terrain elevates cardiorespiratory demand. — Samantha Agate, Fort Worth Star-Telegram, 1 July 2026 The AeroPilates Reformer helps tone muscles, improve flexibility and boost cardio health with customizable intensity for full-body workouts. — Tory Johnson, ABC News, 24 Apr. 2026

Noun

Key Takeaways Combine cardio and strength training to help lower blood pressure. — Karen Berger, Verywell Health, 25 Aug. 2026 At various points during the class, you may be asked to move between the reformer and cardio sides of your machine. — Maggie Donahue, HEALTH, 24 Aug. 2026 See All Example Sentences for cardio

Word History

First Known Use

Adjective

1972, in the meaning defined above

Noun

1987, in the meaning defined above

Time Traveler

The first known use of cardio was in 1972

See more words from the same year

Cite this Entry

Style

“Cardio.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cardio. Accessed 1 Sep. 2026.

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Medical Definition

cardio

1 of 2 adjective

car·dio ˈkärd-ē-(ˌ)ō

: cardiovascular sense 2

cardio exercises

worked out on cardio machines

cardio

2 of 2 noun

: cardiovascular exercise

30 minutes of cardio daily

cardio

adjective

noun

Examples of cardio in a Sentence

Word History

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Cite this Entry

Medical Definition

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