Journal
Journal
Short, useful pieces about understanding your own data, in plain English.
What your resting heart rate is actually telling you (and what it isn't)
A useful, slow-moving signal about how your body is coping. Read it against your own normal, not someone else's.
HRV explained: why your number only matters compared with your own normal
Heart rate variability is personal, noisy and easy to over-read. Here's how to look at it sensibly.
Why your watch's sleep score and how you feel don't always agree
Your watch estimates sleep from movement and heart rate. Here's what it can and can't see, and which to trust.
Small experiments: how to find out what actually works for you
Generic advice is a starting point. One small change, tried properly, tells you what works for you.
AI, a coach and a clinician: how each layer of support adds up
What software can do well, what only a person can do, and where medical expertise comes in. How Tempest puts the three together.