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

Built to keep your feet stable and supported while walking, running, and even during HIIT workouts, the lightweight Cloud X 4 Sneakers can be worn to just about any activity on your trip’s itinerary. —Amelia McBride, Travel + Leisure, 19 Apr. 2025

Pros: Supersoft material; minimal compression; lasting comfort; sweat-wicking Cons: Not compressive enough for HIIT classes Sizes: 00–16 Materials: Nylon, elastane Colors: 9 Jessie Quinn is a freelance journalist with a focus on all things fashion and beauty. —Jessie Quinn, Glamour, 16 Apr. 2025

Studio Fire offers both the yin and yang of group fitness with classes using vinyasa yoga, sculpt, HIIT, dance cardio and more. —Tamia Boyd, Charlotte Observer, 16 Apr. 2025

Now, most of us know that there are enduring metabolic impacts of intensive activities like long runs, high-intensity impact training (HIIT) or even sports training sessions – which often occur at night after work. —New Atlas, 15 Apr. 2025

Word History

First Known Use

1994, in the meaning defined above