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Evidence-based HIIT protocols for improving cardiorespiratory fitness The Norwegian 4x4 • 4 minutes at the maximum intensity you can sustain (for a given pace, this is usually ~85-95% HRmax) • Followed by 3 minutes of low-intensity recovery (~70% HRmax) • Repeat 4x The 1-Minute On/1-Minute Off • Perform a... show more
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These are wonderful. I have been doing the first two for years. Excellent quality of life from these.

Just added the 4x4 to my routine…

Omg a non-political post in my feed. Thank you! 😭

4 times? , is this for elite athletes?

Within that 4 minutes, it takes about a minute for me to get to the 85%-95% range. Is that okay, or does that mean I should go for 5 minutes? Also the final 90 seconds of that 4 minutes get me really close to max heart rate.

Tabata is my go to - 3 x’s a week
