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Your data
Your coach reads one place: intervals.icu. Whatever you connect there, it can see, which is why adding a device never means giving us another password.
intervals.icu
Not connected yet. Without it the coach has nothing to read.
What you can plug into it
Each of these connects on intervals.icu. Sleep and HRV matter most to the coach: they are what the morning read is built on.
We only ever read. Nothing the coach does writes back to intervals.icu or to your device.