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

[BootinUp]

Last edited Sat Nov 8, 2025, 02:06 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.