Heard the words “Norwegian 4x4” while refilling your water bottle at the gym or on social media recently? You’re not imagining things - this high-intensity interval training method has become the talk ...

I first tried the Norwegian 4x4 workout a year ago, and since then, it has become a staple of my fitness routine. I don't do it every week (some folks do), but it's a workout I keep returning to ...

This workout consists of four-minute bursts of exercise, done at 85 to 95% of your maximum heart rate. Afterwards, you get ...