HIIT

abbreviation or noun

ˈhit 

: a form of interval training that alternates very brief periods (such as 20 to 40 seconds) of intense exercise at maximum effort with periods (such as 15 to 30 seconds) of less intense exercise : high-intensity interval training

HIIT, or high-intensity interval training, is a training technique that requires you to perform quick, intense bursts of exercise, followed by short and active recovery periods.

—Sudhakar Jha

Examples of HIIT in a Sentence

Recent Examples on the Web

What Researchers Found On average, both the HIIT and the moderate-intensity groups lost similar amounts of fat mass. —Julia Sullivan, Health, 23 Feb. 2026

Nowhere in my agreement with the universe, did anyone tell me that my sixth decade should make room for crop tops, bikinis, or HIIT classes with my own children. —Danielle Pergament, Allure, 18 Feb. 2026

There are 12 categories of classes such as various yoga practices, cycling, boxing, group treadmill running, Barre, HIIT and so on. —Larry Olmsted, Forbes.com, 5 Feb. 2026

At the same time, frequently training with zone 2 cardio can also benefit you during higher-intensity exercise, like weightlifting or HIIT workouts. —Jenny McCoy, SELF, 28 Jan. 2026

Word History

First Known Use

1994, in the meaning defined above