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How to measure HRV

Chest straps like the Polar H10 are the gold standard for HRV measurement. Wrist-based devices (e.g., Apple Watch) aren't perfect but are surprisingly decent for raw data — if you use them correctly. Most dedicated HRV apps (HRV4Training, Elite HRV) are clunky. Apple Health has a good UI

Testing micro.blog

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Quoting Ezra

"I think there's a useful analogy to draw here. I think a lot about an article Mark Danner wrote in the New York Review of Books many years ago about the Iraq War, and it's an article that has stuck in my mind forever, because

a poem about human suffering

"The Suffering Are Both Pointless and Destined" I found this sentence in my notebook; I don't know if I wrote it or if it's from a book. I asked ChatGPT to write a poem about it; I think it did a good job -

Quoting Kazuo Ishiguro

“The fascinating thing for me is the way people respond to being dealt a really bad hand. And sometimes it seems to me that if there is all you know, if that’s the world you have grown up in, you cannot see the boundaries for which you have to

path to mastery

path to mastery

1/ Valid Environment Learning requires a clear link between decisions and outcomes. If results are mostly random, there’s little to learn. Counter example: most stock picker. 2/ Repetition with Feedback Skills don’t develop from rare events. Repetition without feedback is useless. Counter example: political commentator. 3/ Timely Feedback

Hume’s law

Hume’s law

TIL Hume's Is-Ought Problem Hume argued we can't logically move from describing what is (facts) to prescribing what ought to be (morals). Example1: * Is: "Humans can eat meat." * Ought: "Therefore, humans should eat meat." Example2: * Is: "Air travel is convenient."