Science shows that 4 minutes is the perfect dose to heal the heart.

[BootinUp]

Last edited Sat Nov 8, 2025, 03:06 PM - Edit history (1)

Excerpt

A patient walks into a cardiac rehab center in Norway, scared to take a flight of stairs. Twelve weeks later, the same patient is exercising harder than many healthy people half his age.
What happened in between wasn’t a miracle drug or a surgery. It was a stopwatch, a treadmill, and a pattern that looks almost too simple: four minutes hard, three minutes easy, repeated four times.
That rhythm became known as the Norwegian 4×4, and it has quietly rewritten the rules of how we heal the heart, reverse metabolic disease, and slow the biology of aging.

https://open.substack.com/pub/drlauriemarbas/p/the-science-shows-four-minutes-is?r=1uz6fn&utm_medium=ios

Note: DU'er Native posted a link to a worksheet based on the Norwegian protocol, see post number 8 below.

[hlthe2b]

1. Those cold, long, dark winters are certainly conducive to this research... Kudos, Norway

[BootinUp]

2. True, made me chuckle. Nt

[erronis]

14. Wonder how they keep their birthrate in line....

[appalachiablue]

3. Thanks for this, important to know. ❤

[BootinUp]

4. Sure.

[Baitball Blogger]

5. Sounds like the Japanese walk.

[BootinUp]

6. pretty similar I'm sure.

[Native]

11. Similar but vastly different in that it's the 4 minute mark that rebuilds the heart (according to the research).....

Japanese walking is based on 3 minute intervals. According to the research on Norwegian 4x4: "Four minutes is the sweet spot. It’s long enough to let your heart reach full output, but short enough that you can repeat it several times." And that's why you see your heart begin to repair itself.

[rickford66]

7. Thanks for this

I'm not a gym rat so this is something I can do at home. I will share with my cardiologist I see in December.

[Native]

8. Has anyone upgraded to access the worksheet?

I found a guide on this site, and it looks pretty legit. I just don't know if it's the same.
https://norwegian4x4.com/posts/ultimate-guide-norwegian-4x4-workouts

[BootinUp]

9. No. But I would suggest the worksheet is not really needed. What is needed, is

consistent habit you can maintain. Consistency is what wins.

[Native]

10. I edited my post. Check out the guide I found. It seems very comprehensive, and it outlines how to work up to using the

full protocol. Obviously if you have heart issues, you have to build up to following the full protocol, and it requires a heart monitor of sorts (watch, strap), stop watch/app, etc..

[c-rational]

17. Bingo. I had been doing the Japanese style walk but today I will switch to Norweigan. Thanks.

[ms liberty]

12. KR&B

[orangecrush]

13. Kick

[ultralite001]

15. Generation 100 + 4 x 4...

Generation 100 is an exercise study following more than 1500 women and men in their 70s for five years. The aim was to find out if exercise can give elderly a longer and healthier life, and also to compare the effects of high-intensity interval training and moderate training.

[progressoid]

16. We need something like this for the mass anger and delusion in the USA.

[littlemissmartypants]

19. Ever heard of a dammit doll? 🤓😉

[xuplate]

18. Thanks

I’m always looking for information about the least amount of exercise I can do to let my organs know I’m still alive.

[littlemissmartypants]

20. 💪❤️

[BobTheSubgenius]

21. It seems like a more rigid version of HITT.

[BootinUp]

22. I would say it's more specific for treating

heart issues. A Quick Look at the Marines HITT indicates it has broader goals.