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Learn the signals your watch is already recording
Your Apple Watch records a handful of signals that genuinely predict how your body is coping. These guides explain what each one means, what a normal range looks like, and how to act on it.
What is HRV, and what is a good score?
Heart rate variability (HRV) is the variation in time between consecutive heartbeats, measured in milliseconds. Here is what it reflects, what a…
Read the guide →What is a recovery score?
A recovery score condenses HRV, resting heart rate, and sleep into a single readiness percentage. Here is what goes into one, why scores differ…
Read the guide →What is sleep debt?
Sleep debt is the running shortfall between the sleep you need and the sleep you get. Here is how it accumulates, why one long lie-in does not clear…
Read the guide →What is Zone 2 training?
Zone 2 is conversational-pace aerobic work, roughly 60 to 70 percent of maximum heart rate. Here is what it adapts, how much you need, and how to…
Read the guide →What is readiness?
Readiness combines what your body measures with how you actually feel. Here is why the two disagree, which one to trust when they do, and how to…
Read the guide →Why we write these
Apex Health: Recovery Coach is built on a small number of physiological ideas: that heart rate variability is only meaningful against your own baseline, that sleep debt accumulates faster than it repays, that most people train too hard on their easy days. If you are going to trust an app's verdict, you should be able to check its reasoning.
These guides are the reasoning, written plainly and without the product getting in the way. They are free, they carry no advertising, and they are accurate to the best of our knowledge at the time of writing. They are also not medical advice.
Wake up to a verdict, not a spreadsheet.
Apex Health: Recovery Coach turns the Apple Health data you already generate into one clear decision each morning. Free, private, and entirely on your device.
Apex Health: Recovery Coach provides general wellness and fitness information computed from your own data. It is not a medical device and does not diagnose, treat, or prevent any condition. Always consult a qualified professional for medical concerns.