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As a sleep tracker, evidence suggests that things like Whoop, Beddit, etc work, but HRV for recovery in athletes, not so much.
https://www.uphillathlete.com/why-we-stopped-relying-on-hrv-apps/
Also at £25/month? Hard pass.
Proper HRV measurements are supposed to be taken laying down or sitting (pick one and stick with it) and at the same time of day, typically before doing anything. So, trying to calc HRV after an exercise session seems even more pointless than trying to measure it accurately.