diff --git a/ios/App/App/CoachWorkoutKit.swift b/ios/App/App/CoachWorkoutKit.swift
index 5410fc7..1aa5915 100644
--- a/ios/App/App/CoachWorkoutKit.swift
+++ b/ios/App/App/CoachWorkoutKit.swift
@@ -9,8 +9,10 @@
 //     activity: 'running' | 'cycling' | 'walking' | 'hiking',
 //     displayName: 'Coach séance 6×3min Z4',
 //     warmupMin: 10,
-//     work: { duration_min: 3, hr_zone: 4 },
-//     rest:  { duration_min: 1.5, hr_zone: 2 },
+//     // Préférer hr_bpm_min/max (nos zones cardiaques Karvonen) à hr_zone
+//     // (zones génériques %FCmax d'Apple) — voir sendInterval.
+//     work: { duration_min: 3, hr_bpm_min: 132, hr_bpm_max: 145 },
+//     rest:  { duration_min: 1.5, hr_bpm_min: 95, hr_bpm_max: 110 },
 //     repeats: 6,
 //     cooldownMin: 10,
 //   })
@@ -60,36 +62,49 @@ public class CoachWorkoutKitPlugin: CAPPlugin, CAPBridgedPlugin {
         let cooldownMin = call.getDouble("cooldownMin") ?? 10
         let repeats = max(1, min(50, call.getInt("repeats") ?? 6))
 
-        // Nouveau format : blockSteps = [{ type, duration_min, hr_zone, label }, ...]
+        // Nouveau format : blockSteps = [{ type, duration_min, hr_zone, hr_bpm_min, hr_bpm_max, label }, ...]
         // type = "work" | "recovery"
+        // hr_bpm_min / hr_bpm_max (optional) = plage cible en BPM EXPLICITE.
+        //   Quand fournie, on pousse un HeartRateRangeAlert -> ce sont NOS zones
+        //   cardiaques (Karvonen HRR sous bêta-bloquant) qui s'appliquent dans
+        //   l'app Exercice, et non les zones génériques %FCmax d'Apple.
+        // hr_zone (optional) = fallback zone Apple 1-5 si pas de plage BPM.
         // label (optional) = displayName affiché sur l'Apple Watch pour ce step
         //   (ex. "Course", "Marche", "Vélo"). Si nil → Watch affiche le label
         //   natif Apple "Travail" / "Récupération".
         // Backward compat : si pas blockSteps, lit work + rest comme avant.
-        var stepsSpec: [(min: Double, hrZone: Int?, isWork: Bool, label: String?)] = []
+        var stepsSpec: [(min: Double, hrZone: Int?, bpm: ClosedRange<Double>?, isWork: Bool, label: String?)] = []
+        func bpmRange(_ lo: Any?, _ hi: Any?) -> ClosedRange<Double>? {
+            guard let lo = lo as? Double, let hi = hi as? Double,
+                  lo > 0, hi > 0, hi >= lo else { return nil }
+            return lo...hi
+        }
         if let raw = call.getArray("blockSteps") as? [[String: Any]], !raw.isEmpty {
             for (i, s) in raw.enumerated() {
                 let durMin = (s["duration_min"] as? Double) ?? 0
                 if durMin <= 0 { continue }
                 let hrZone = s["hr_zone"] as? Int
+                let bpm = bpmRange(s["hr_bpm_min"], s["hr_bpm_max"])
                 let typeStr = (s["type"] as? String) ?? (i % 2 == 0 ? "work" : "recovery")
                 let label = s["label"] as? String
-                stepsSpec.append((durMin, hrZone, typeStr == "work", label))
+                stepsSpec.append((durMin, hrZone, bpm, typeStr == "work", label))
             }
         } else {
             // Backward compat — work + rest (rest skipped si 0)
             let workDict = call.getObject("work") ?? [:]
             let workMin = workDict["duration_min"] as? Double ?? 3
             let workHrZone = workDict["hr_zone"] as? Int
+            let workBpm = bpmRange(workDict["hr_bpm_min"], workDict["hr_bpm_max"])
             let workLabel = workDict["label"] as? String
-            stepsSpec.append((workMin, workHrZone, true, workLabel))
+            stepsSpec.append((workMin, workHrZone, workBpm, true, workLabel))
 
             let restDict = call.getObject("rest") ?? [:]
             let restMin = restDict["duration_min"] as? Double ?? 1.5
             let restHrZone = restDict["hr_zone"] as? Int
+            let restBpm = bpmRange(restDict["hr_bpm_min"], restDict["hr_bpm_max"])
             let restLabel = restDict["label"] as? String
             if restMin > 0 {
-                stepsSpec.append((restMin, restHrZone, false, restLabel))
+                stepsSpec.append((restMin, restHrZone, restBpm, false, restLabel))
             }
         }
 
@@ -181,7 +196,7 @@ public class CoachWorkoutKitPlugin: CAPPlugin, CAPBridgedPlugin {
         activity: HKWorkoutActivityType,
         displayName: String,
         warmupMin: Double,
-        stepsSpec: [(min: Double, hrZone: Int?, isWork: Bool, label: String?)],
+        stepsSpec: [(min: Double, hrZone: Int?, bpm: ClosedRange<Double>?, isWork: Bool, label: String?)],
         repeats: Int,
         cooldownMin: Double
     ) async throws {
@@ -202,7 +217,15 @@ public class CoachWorkoutKitPlugin: CAPPlugin, CAPBridgedPlugin {
         //    par "Course"/"Marche"/"Vélo" etc. selon le sport.
         let intervalSteps: [IntervalStep] = stepsSpec.map { spec in
             var ws = WorkoutStep(goal: .time(spec.min * 60, .seconds))
-            if let zone = spec.hrZone {
+            // Priorité à la plage BPM explicite (nos zones cardiaques Karvonen) ;
+            // sinon fallback sur la zone Apple générique 1-5.
+            if let bpm = spec.bpm {
+                let unit = WorkoutAlertMetric.countPerMinute
+                ws.alert = HeartRateRangeAlert(
+                    target: Measurement(value: bpm.lowerBound, unit: unit)
+                        ... Measurement(value: bpm.upperBound, unit: unit)
+                )
+            } else if let zone = spec.hrZone {
                 ws.alert = HeartRateZoneAlert(zone: zone)
             }
             // displayName n'est dispo qu'à partir d'iOS 18. Sur iOS 17, on