Looks interesting. And it's pure Python with no 3p packages. Pretty trivial to support other OSes: make that audio player invocation configurable.

Very nice. I have no heart issues but have been experimenting with extended breathing/longer exhales to calm down my sympathetic nervous system. I believe intentional breathing is a big, mostly underutilized tool all of us have to be generally more relaxed and healthier and also to calm ourselves down in stressful situations

This reminds me of another HRV training from few years back shared here.

- https://news.ycombinator.com/item?id=37538028

- https://github.com/kieranabrennan/every-breath-you-take

Terminally breathing

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