Do you even know what HIIT stands for? We have the answer to that—and more.

The study found that while different exercises helped reduce body fat, only HIIT was able to preserve muscle mass at the same ...

A six-month study found HIIT helped older adults reduce body fat while preserving muscle mass, offering a potential advantage ...

Scientists say HIIT may help you lose fat without sacrificing muscle as you age. Here's what a new study found – and why Elsa Pataky is a fan of the workout.

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. I first tried the ...

High-intensity interval training in water, often called aquatic HIIT (AHIIT) improves exercise capacity in adults with chronic conditions and has an effect similar to that of land-based training ...

Endothelial dysfunction is a hallmark of cardiovascular disease (CVD) and plays a central role in vascular inflammation, thrombosis, and impaired vasodilation. A study led by researchers from Miguel ...

Fitness experts break down the new research.

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A new study by UNC Greensboro (UNCG) researchers suggests giving children just nine minutes to engage in high-intensity interval exercise can boost their academic performance. "In the classroom, you ...