What's on the watch
The watch app is a set of pages you swipe between. Each one is built for a quick glance or a quick entry, so you rarely need to take out your phone.
- Today - a row for each daily number: Guidance, Recovery, Sleep, Body Battery, Stress, Exertion, Energy, Steps and Sunlight, each with a ring and its value.
- Heart Rate - your live heart rate with a background that changes colour by heart rate zone, plus minimum, average and maximum.
- Water - turn the Digital Crown to choose an amount; the label changes from Shot to Cup, Mug, Bottle and Large as you go.
- Caffeine - 17 preset drinks plus the custom drinks you saved on your iPhone.
- Glucose - enter a reading in mg/dL or mmol/L and tag it Unspecified, Fasting, Before Meal or After Meal.
- Blood Pressure - systolic and diastolic steppers in mmHg.
Scores and detail screens on the wrist
Tap any row on the Today page to open its detail screen: a large ring and the key facts behind that score. Recovery, for example, shows your resting heart rate and HRV next to your usual level. Body Battery shows a Last 24 Hours curve, and Stress shows Last 24 Hours bars, so you can see when the day drained or recharged you.
Sleep opens last night's duration, stages, timing and sessions. Tap a session to see a hypnogram alongside your heart rate with the sleep stages marked, the same kind of view you get on iPhone.
The Guidance row opens the day's suggestion from the phone, with its headline and a short explanation.
The watch also works out your scores on the wrist using the same scoring as the iPhone app, so they stay current even while your phone is locked in a bag.
Why having it on your wrist matters
Health data is most useful at the moment you make a decision: before a run, after a stressful meeting, when you reach for a third coffee. A score that lives only in a phone app tends to get checked once in the morning and then forgotten. On the wrist, a glance at Body Battery or Stress can change what you do next.
Logging works the same way. Habits like drinking enough water or keeping caffeine in check depend on recording things as they happen. A few turns of the Digital Crown is fast enough that you actually do it, and every entry saves to Apple Health so it shows up on your iPhone too. Water and caffeine entries can be backdated with a time picker if you forgot to log at the time.
Live heart rate
The Heart Rate page shows your current beats per minute, with the background colour shifting as you move between heart rate zones, and keeps track of your minimum, average and maximum. Tap Start Live Tracking for a continuous session when you want a steady readout, for example during a walk or a workout you are not recording elsewhere. The app warns that a live session counts as exercise time on your watch.
FitRest is a wellness app, not a medical device. If a heart rate reading worries you, talk to a doctor.
Complications and arranging pages
Nine complications bring FitRest to your watch face, and they also work as Smart Stack cards on watchOS 10 and later. Health Summary shows Body Battery, recovery and sleep together in a rectangular slot. Body Battery, Recovery, Sleep Quality, Stress, Exertion and Sunlight each come in circular, corner, inline and rectangular styles. Water and Caffeine show today's total, with Water drawn as a ring against your daily goal, and tapping either opens the matching log page.
You arrange the watch from your iPhone. In Settings > Apple Watch > Watch Pages you can reorder or hide pages, reorder or hide the rows on the Today page, and set the default amount for the Water page. The watch follows your iPhone's language and units automatically.
How to use it
- 1Add the Recovery or Health Summary complication to your main watch face so last night's verdict is the first thing you see.
- 2Check Body Battery or Stress on the Today page before deciding on an evening workout.
- 3Log water and coffee from the watch as you drink them, using the time picker for anything you forgot.
- 4Open Watch Pages on your iPhone and hide pages you don't use so the ones you do are a single swipe away.
- 5Use Start Live Tracking on the Heart Rate page when you want a continuous heart rate readout.