How it works.
Four steps. You do one of them once.
Connect Garmin
Make a free intervals.icu account, connect it to Garmin Connect, and give Ceiling its key. You do this once.
Ceiling pulls about a year of history on day one, then keeps up on its own.
Wake up to your prescription
As soon as your watch syncs, last night is read against your normal: sleep, HRV, resting heart rate, and what you've done lately.
You get one call: day off, walk, easy, steady or hard. Then the session, the heart rate to hold, the least that still counts, the most you can do, and what tomorrow looks like.
Train
Ride, run, hike or ski. The prescription gives you options from the activities you actually do, with the same heart rate whatever you pick.
Afterwards, the session is scored out of 100 against what was prescribed: under the ceiling, in the range, and the right length.
It adapts
Tomorrow is re-planned from what you actually did and anything you logged, like three drinks or a sore throat. In the morning, last night's sleep and HRV have the final say.
Once there are a few nights of a kind, Ceiling shows you what they do to your next-morning HRV.
What it reads
From Garmin, through intervals.icu
- Overnight HRV
- Resting heart rate
- Sleep: how long, and Garmin's sleep score
- Every workout, with its heart rate second by second
- Power, on rides with a power meter
- About a year of history, on day one
It checks every 15 minutes through the day, and every 10 in the morning until last night's data lands.
Not read
- Body Battery
- Garmin's stress score
- All-day heart rate
- Breathing rate
- Steps
Your data stays yours: it's kept in your own account and never sold.
Other watches
Garmin doesn't send HRV to Apple Health, so Garmin connects directly. Apple Watch does, so Apple Watch through Apple Health is next. A 2-minute morning HRV reading with a chest strap, in the iPhone app, is planned too.