diff --git a/ios/App/CoachWatch/WorkoutManager.swift b/ios/App/CoachWatch/WorkoutManager.swift
index d8dd147..67af0bb 100644
--- a/ios/App/CoachWatch/WorkoutManager.swift
+++ b/ios/App/CoachWatch/WorkoutManager.swift
@@ -23,7 +23,10 @@ final class WorkoutManager: NSObject, ObservableObject {
     private var builder: HKLiveWorkoutBuilder?
 
     private var lastSentAt = Date.distantPast
-    private let sendInterval: TimeInterval = 2
+    // Throttle léger anti-saturation BLE pour les metrics à haute fréquence
+    // (calories/distance). La FC, elle, est poussée immédiatement à chaque
+    // nouvel échantillon — comme l'app Exercice native d'Apple.
+    private let minSendInterval: TimeInterval = 0.5
     private var simTask: Task<Void, Never>?
 
     private override init() { super.init() }
@@ -137,7 +140,10 @@ final class WorkoutManager: NSObject, ObservableObject {
         elapsedSec = elapsed
 
         let now = Date()
-        guard now.timeIntervalSince(lastSentAt) >= sendInterval else { return }
+        // Nouvelle FC -> envoi immédiat (temps réel, comme Apple). Sinon (mise à
+        // jour calories/distance seule), on applique le throttle anti-saturation.
+        let heartRateUpdated = hr != nil
+        guard heartRateUpdated || now.timeIntervalSince(lastSentAt) >= minSendInterval else { return }
         lastSentAt = now
         ConnectivityManager.shared.sendSample([
             "heartRate": heartRate,