The 4x4 Protocol I Use for Brain Health and Alzheimer's Prevention

Tim Ferriss · · 7 min
Watch the episode 7 min · YouTube

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Tim, Kevin, Joe and Andrew agree on 26 things

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3:36 Norwegian 4x4 · "If you do something called the Norwegian 4 by 4 — it's VO2 max training, so it's very very intense — four..."

What do Tim and experts like them all swear by?

26 things in common

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