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 ...
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Boost cardio fitness with this beginner-friendly alternative to the trending 4x4 Norwegian interval workout
The Norwegian 4x4 workout has been touted as the ultimate longevity-boosting workout, credited for significantly improving aerobic fitness scores over just eight weeks. Popular among runners and ...
The intensity of the 4x4 workout can improve your cardiovascular health. TORWAISTUDIO/ Shutterstock Lack of time is often the main reason people don’t exercise regularly. But a type of interval ...
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