high-intensity interval training

[ hahy-in-ten-si-tee in-ter-vuhl trey-ning ]

noun

1. a type of interval training for physical conditioning and fitness that uses short bursts of very intense exertion, alternating with short periods of rest or lighter exertion, to exploit the body’s systems for generating anaerobic energy. HIIT, H.I.I.T.

Word History and Origins

Origin of high-intensity interval training¹

First recorded in 1975–80