rate variability
4 feeds in the directory cover this.
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HRV4Training's Substack
Heart rate variability updates from HRV4Training

Marco Altini’s Substack
Heart rate variability (HRV), Endurance Coaching, Technology, Life, and other ramblings

Mindcreaser - Benjamin Portheault's substack
Aspects of performance for chess/esports, especially mental prep

THRIVE 120 Substack with TriplePlayDoc
Health made simple
Machine-readable: this list of feeds, as JSON · their recent posts, as JSON Feed · all topics
