April 19, 2022

In 2009, New York Times writer Gretchen Reynolds discovered something big: Readers loved to click on stories about tiny increments of exercise. That June, Reynolds wrote her first story about single-digit high-intensity interval training, or HIIT. The piece, titled “Can You Get Fit in Six Minutes a Week?,” described a study from Martin Gibala, professor of kinesiology at McMaster University in Ontario, Canada, on the effects of stationary biking. Slate

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