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The NexRex watch app puts the four things you do most often on your wrist. Open the app when your phone is away or mid-workout and everything you log syncs back automatically — even if the watch is out of range.

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What you can do from the watch

Idle, the watch shows a 2×2 launcher. Each tile carries a live subtitle so the screen is useful before you tap it.
The Run tile is unchanged — it pushes the same pre-run screen NexRex has always shown. This page focuses on the three new health tiles.

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Logging water

Tap Water to open the hydration ring for today. Under the ring are three quick-add buttons:
  • +150
  • +250
  • +500
Amounts follow the unit preference you set on your phone (ml or oz). Each tap adds that amount to today’s total and updates the ring immediately.
The ring uses an optimistic overlay, so it never rewinds between your tap and the phone’s echo. If you tap out of range, the amount is still applied locally and syncs when the phone reconnects.

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Adding the hydration complication

You can put today’s hydration on your watch face so you never have to open the app to check where you are.
  1. Long-press your watch face and tap Edit.
  2. Swipe to the Complications page.
  3. Tap a slot and pick NexRex — Hydration.
  4. Press the crown to save.
The complication is available on circular, corner, inline, and rectangular slots and shows today’s amount against your daily goal. Tapping it opens straight to the Water screen. The ring empties automatically at local midnight, even if your phone hasn’t checked in yet.
The hydration complication requires watchOS 9 or later. The watch app itself runs on watchOS 8, so older watches still get water, weight, and recovery logging — just without the face complication.

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Logging a weigh-in

Tap Weight to open the crown dial. The dial seeds to your last synced weigh-in so most weeks you only nudge it a few tenths.
  • Turn the crown to step by ±0.1 in your display unit (kg or lb).
  • Tap the value to give the dial crown focus if you’ve switched focus to the body-fat row.
  • Tap Log to save. The value is converted back to kilograms behind the scenes, so an imperial user can dial pounds and the same reading appears on the phone.

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Body fat (optional)

Below the weight, a smaller dial edits body-fat percentage. To include it in this weigh-in:
  1. Tap the body-fat row to move crown focus to it.
  2. Turn the crown to dial a value between 2% and 60%.
  3. Tap Log.
Body fat is only sent when you’ve explicitly dialled it — a plain weigh-in won’t invent a reading. The last body-fat value on the phone seeds the row the next time you open the screen.
Weight and body-fat entries land on the same daily health-metrics feed as the rest of your NexRex data, so a wrist weigh-in shows up on your weight chart, in weekly summaries, and against your weight goal — no separate reconciliation required.

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Checking in on recovery

Tap Recover for a daily recovery check-in.

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Clear day

If nothing hurts, tap Feeling good. That records a clear check-in for today and closes the screen. Do this every morning — a run of clear check-ins is what powers your recovery trend.

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Reporting soreness

To flag a sore area:
  1. Scroll to the zone that hurts — quad, hamstring, calf, achilles, knee, IT band, glute, hip, shin, ankle, foot, or lower back.
  2. Tap the zone.
  3. Pick a side — Left, Both, or Right. (Lower back has no side picker.)
  4. Turn the crown to dial severity from 1 (barely noticeable) to 10 (can’t run).
  5. Tap Log.
The zone plus side compose into the same body-part label the phone uses (for example, right quad), so a wrist check-in and a phone check-in show up as the same entry — you can start on one and finish on the other without duplicates.
Reporting soreness overwrites any earlier soreness value for the same zone today. Log the worst reading you’ve felt in the day.

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Offline sync

Everything you log from the wrist queues locally and delivers exactly once.
  • Out of range? Tap anyway. The log persists on the watch and delivers as soon as your phone comes back.
  • Cold-start replays can’t double-log — each entry carries a client-side ID and NexRex dedupes on it end-to-end.
  • Failed writes stay queued and retry. A tap only clears from the queue after the phone has successfully written it to NexRex.
You don’t need to do anything to “flush” the queue — leave the phone on and your logs land in the background.

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Setting your goals

The watch reads goals but doesn’t edit them. To change your daily targets:
  • Daily water goal — Settings → Performance & Goal → Nutrition & health goals on the phone.
  • Weight goal — same screen, under Weight goal.
  • Units — Settings → Units on the phone. The watch picks up your choice automatically.
See Nutrition tracking for the full goal-editor walkthrough.

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Troubleshooting

Open NexRex on your phone once so the watch can pull a fresh snapshot. Values update automatically after that as long as the phone is reachable.
Make sure you’re on watchOS 9 or later, the NexRex app has been opened once on the watch, and you’ve logged at least one drink today. The ring resets to zero at local midnight.
Open NexRex on the phone with the watch nearby — the queue drains as soon as the pair is in range. Force-quitting the phone app can delay delivery until the next launch.
Body fat is only sent when the body-fat row has been dialled. Tap the row to focus it, turn the crown to set a value, then tap Log.