Adjust rest time from the watch with the same 1-second stepper

A gear on the watch root opens a small Settings sheet whose stepper
edits the shared restSeconds default (10-180s, 1s steps). Edits ride a
new settingsUpdate message to the phone - debounced per stepper burst,
falling back to transferUserInfo when unreachable - which clamps the
value, writes the shared default, and re-echoes it to every device
through the application context. While an edit is pending on the watch,
an in-flight context's stale rest value is skipped so it can't yank the
stepper back mid-edit.

CHANGELOG.md

@@ -4,6 +4,8 @@ Workouts is now on the Mac: a native app for managing routines and schedules and
 
 Rest time now adjusts in one-second steps — in Settings and in a routine's custom rest — instead of five-second jumps.
 
+Rest time can now be changed on the watch too — a new Settings sheet with the same one-second stepper, synced back to your iPhone.
+
 A live status panel between the timer and the figure now shows heart rate (with the target color cues, in much larger type), HR zone, calories, and workout time.
 
 A new Library tab puts your routines and the exercise library one tap away instead of buried in Settings.

README.md

@@ -86,8 +86,9 @@ your own iCloud Drive.
   exercise, and run it as a paged flow: a **Ready?** lead-in, count-up work phases,
   count-down rests with final-three-second haptics and auto-advance, and a **Finish**
   page with **One More** and a **Done** that auto-completes after a countdown. A
-  phase-dot row (purple work, teal rest) tracks progress. Rest time and the
+  phase-dot row (purple work, teal rest) tracks progress. A Settings sheet on the
-  auto-finish countdown are configurable; changes sync back to the phone.
+  watch adjusts the rest time in 1-second steps; the change syncs back to the
+  phone, which echoes it to every device.
 - **Two-way live run** — prop your iPhone up during an Apple Watch workout and it runs
   the same Ready → work/rest → Finish flow with live timers, in step with the watch. It's
   bidirectional: drive from either device — swipe ahead, finish a set, add one — and the

Shared/Connectivity/WCPayload.swift

@@ -21,6 +21,7 @@ enum WCPayload {
 
     static let workoutUpdateType = "workoutUpdate"   // watch → phone (one workout)
     static let requestSyncType = "requestSync"       // watch → phone (please push state)
+    static let settingsUpdateType = "settingsUpdate" // watch → phone (a setting changed on the watch)
     static let liveProgressType = "liveProgress"     // watch → phone (ephemeral mirror frame)
     static let liveEndedType = "liveEnded"           // watch → phone (stop mirroring a run)
     static let liveHeartRateType = "liveHeartRate"   // watch → phone (ephemeral HR sample)
@@ -82,6 +83,16 @@ enum WCPayload {
 
     static func requestSyncMessage() -> [String: Any] { [typeKey: requestSyncType] }
 
+    // MARK: - Watch → Phone (a setting changed on the watch)
+
+    /// The watch's settings edits ride to the phone, which owns the durable value and
+    /// echoes it back to every device through the application context. Carries only the
+    /// settings the watch can edit (just rest time today); reuses the context's key, so
+    /// `decodeRestSeconds` reads both.
+    static func encodeSettingsUpdate(restSeconds: Int) -> [String: Any] {
+        [typeKey: settingsUpdateType, restSecondsKey: restSeconds]
+    }
+
     // MARK: - Watch → Phone (ephemeral live-run mirror)
 
     /// Anchor `Date`s ride as native plist values (not JSON), so they keep sub-second

Workouts Watch App/Connectivity/WatchConnectivityBridge.swift

@@ -288,8 +288,47 @@ final class WatchConnectivityBridge: NSObject {
         }
     }
 
+    // MARK: - Settings edits (watch → phone)
+
+    /// Debounces the stepper's tick-per-second bursts into one settings message.
+    private var settingsSendTask: Task<Void, Never>?
+
+    /// Forward a rest-time change to the phone, which owns the durable value and echoes
+    /// it back through the application context. The local default was already written by
+    /// the setting's `@AppStorage`; debounced so holding the stepper sends once, and the
+    /// send falls back to `transferUserInfo` so the change survives the phone being
+    /// unreachable right now.
+    func sendRestSeconds(_ seconds: Int) {
+        settingsSendTask?.cancel()
+        settingsSendTask = Task { [weak self] in
+            try? await Task.sleep(for: .seconds(0.6))
+            guard let self, !Task.isCancelled else { return }
+            self.settingsSendTask = nil
+            self.pushSettingsUpdate(restSeconds: seconds)
+        }
+    }
+
+    private func pushSettingsUpdate(restSeconds: Int) {
+        guard let session, session.activationState == .activated else { return }
+        let payload = WCPayload.encodeSettingsUpdate(restSeconds: restSeconds)
+        if session.isReachable {
+            // Re-encode in the fallback rather than capturing the non-Sendable payload
+            // (the error handler runs on WatchConnectivity's background queue).
+            session.sendMessage(payload, replyHandler: nil, errorHandler: { @Sendable [weak self] _ in
+                Task { @MainActor in
+                    _ = self?.session?.transferUserInfo(WCPayload.encodeSettingsUpdate(restSeconds: restSeconds))
+                }
+            })
+        } else {
+            session.transferUserInfo(payload)
+        }
+    }
+
     private func applySettings(_ dict: [String: Any]) {
-        if let rest = WCPayload.decodeRestSeconds(dict) {
+        // Skip the context's rest value while a local edit is still waiting to be sent —
+        // a concurrent push (triggered by anything) would carry the pre-edit value and
+        // yank the stepper back mid-edit. The phone echoes our value right after it lands.
+        if let rest = WCPayload.decodeRestSeconds(dict), settingsSendTask == nil {
             UserDefaults.standard.set(rest, forKey: WCPayload.restSecondsKey)
         }
         if let done = WCPayload.decodeDoneCountdownSeconds(dict) {

Workouts Watch App/Views/ActiveWorkoutGateView.swift

@@ -27,6 +27,8 @@ struct ActiveWorkoutGateView: View {
     /// takes over editing the run we're inside.
     @State private var path: [ActiveWorkoutRoute] = []
 
+    @State private var showingSettings = false
+
     private var activeWorkouts: [Workout] {
         workouts.filter { $0.status == .inProgress || $0.status == .notStarted }
     }
@@ -66,6 +68,19 @@ struct ActiveWorkoutGateView: View {
                     WorkoutLogListView(workout: workout)
                 }
             }
+            .toolbar {
+                ToolbarItem(placement: .topBarTrailing) {
+                    Button {
+                        showingSettings = true
+                    } label: {
+                        Image(systemName: "gearshape")
+                    }
+                    .accessibilityLabel("Settings")
+                }
+            }
+            .sheet(isPresented: $showingSettings) {
+                NavigationStack { WatchSettingsView() }
+            }
             // The phone's pushes aren't decoding (its app updated first; this one hasn't
             // yet) — everything shown is frozen at the last good sync. Say so rather than
             // silently presenting stale workouts until the watch app catches up.

Workouts Watch App/Views/WatchSettingsView.swift

@@ -0,0 +1,39 @@
+//
+// WatchSettingsView.swift
+// Workouts Watch App
+//
+// Copyright 2026 Rouslan Zenetl. All Rights Reserved.
+//
+
+import SwiftUI
+
+/// The watch's small settings sheet — just the rest time today, adjusted with the
+/// same 1-second stepper as the iPhone. The value lives in the shared defaults key
+/// the phone pushes; edits are forwarded back so the phone (the durable owner)
+/// re-echoes them to every device.
+struct WatchSettingsView: View {
+    @Environment(WatchConnectivityBridge.self) private var bridge
+
+    /// Shared with the phone via the same defaults key (see `WCPayload.restSecondsKey`).
+    @AppStorage("restSeconds") private var restSeconds: Int = 45
+
+    var body: some View {
+        Form {
+            Section {
+                Stepper(value: $restSeconds, in: 10...180, step: 1) {
+                    Text("\(restSeconds)s")
+                        .font(.system(.title3, design: .rounded, weight: .semibold))
+                        .monospacedDigit()
+                }
+            } header: {
+                Text("Rest Between Sets")
+            } footer: {
+                Text("Used between sets and, when auto-advancing, between exercises. A routine's custom rest time overrides it.")
+            }
+        }
+        .navigationTitle("Settings")
+        .onChange(of: restSeconds) { _, seconds in
+            bridge.sendRestSeconds(seconds)
+        }
+    }
+}

Workouts Watch App/WatchScreenshotRoot.swift

@@ -30,6 +30,8 @@ struct WatchScreenshotRoot: View {
                 ProgressHost(workout: workout, exerciseName: "Lat Pulldown", page: 0)
             case "rest":
                 ProgressHost(workout: workout, exerciseName: "Lat Pulldown", page: 1)
+            case "settings":
+                NavigationStack { WatchSettingsView() }
             default:
                 NavigationStack { WorkoutLogListView(workout: workout) }
             }

Workouts/Connectivity/PhoneConnectivityBridge.swift

@@ -249,6 +249,15 @@ final class PhoneConnectivityBridge: NSObject {
         liveRunState.apply(frame)
     }
 
+    /// A setting edited on the watch. The phone owns the durable value: clamp it, write
+    /// the shared default (the same store Settings' `@AppStorage` reads), and re-push the
+    /// application context so every device converges on it.
+    private func applySettingsUpdate(restSeconds: Int) {
+        let clamped = min(max(restSeconds, 10), 180)
+        UserDefaults.standard.set(clamped, forKey: WCPayload.restSecondsKey)
+        pushAll()
+    }
+
     /// Parse the (non-Sendable) WC dictionary in the nonisolated delegate context,
     /// then hop to the MainActor with only Sendable values.
     nonisolated private func route(_ dict: [String: Any]) {
@@ -259,6 +268,10 @@ final class PhoneConnectivityBridge: NSObject {
             if let doc = WCPayload.decodeWorkoutUpdate(dict) {
                 Task { @MainActor in await self.syncEngine.ingestFromWatch(doc) }
             }
+        case WCPayload.settingsUpdateType:
+            if let rest = WCPayload.decodeRestSeconds(dict) {
+                Task { @MainActor in self.applySettingsUpdate(restSeconds: rest) }
+            }
         case WCPayload.liveProgressType:
             if let frame = WCPayload.decodeLiveProgress(dict) {
                 Task { @MainActor in self.applyIncomingLive(frame) }