Every morning, my Oura ring gives me a readiness score. Under the hood, the most important input is heart rate variability — the tiny fluctuations in timing between heartbeats.
High HRV generally means your autonomic nervous system is in a good state. Parasympathetic dominance. Your body is recovered and ready to absorb stress. Low HRV means you’re still processing something — a hard workout, bad sleep, alcohol, anxiety.
What most people get wrong: HRV is not a daily score to optimize. It’s a trend line. One bad night doesn’t mean anything. Five bad nights in a row means you need to back off.
The data lake I’m building pulls HRV, resting heart rate, sleep stages, and training load into one place. The patterns that emerge when you overlay training stress on recovery metrics are genuinely illuminating. Your body is already telling you everything. You just need to learn to read it.
The hard part isn’t collecting the data. It’s being honest about what it says.