diff --git a/rhythm_coach/assets/career/milestones.json b/rhythm_coach/assets/career/milestones.json
index aa25979..e6950f3 100644
--- a/rhythm_coach/assets/career/milestones.json
+++ b/rhythm_coach/assets/career/milestones.json
@@ -364,6 +364,287 @@
         {"time": 54, "text": "Bonne fille. Tu sais aspirer.", "mode": "breath", "duration": 6}
       ]
     },
+    {
+      "id": "intro_posture_sitting",
+      "displayLabel": "Assieds-toi et ouvre-toi",
+      "level": 4,
+      "branches": ["obeissance"],
+      "requires": ["basics"],
+      "unlocks": ["posture_sitting"],
+      "sequence": [
+        {
+          "time": 0,
+          "text": "Aujourd'hui tu obéis à une consigne de position. Assieds-toi bien droite, écarte les genoux, et présente-toi.",
+          "mode": "breath",
+          "duration": 8
+        },
+        {
+          "time": 8,
+          "text": "Dans cette position, tu me prends en bouche. Commence doucement.",
+          "mode": "rhythm",
+          "from": "tip",
+          "to": "head",
+          "bpm": 80,
+          "duration": 16
+        },
+        {
+          "time": 24,
+          "text": "Reste assise, dos droit. Continue.",
+          "mode": "lick",
+          "from": "tip",
+          "to": "head",
+          "bpm": 70,
+          "duration": 16
+        },
+        {
+          "time": 40,
+          "text": "Souffle. Garde la position.",
+          "mode": "breath",
+          "duration": 6
+        },
+        {
+          "time": 46,
+          "text": "Encore. Tu restes assise, offerte, et tu bosses.",
+          "mode": "rhythm",
+          "from": "head",
+          "to": "mid",
+          "bpm": 85,
+          "duration": 18
+        },
+        {
+          "time": 64,
+          "text": "Bien. Voilà ta position assise. Tu la connais maintenant.",
+          "mode": "breath",
+          "duration": 8
+        }
+      ]
+    },
+    {
+      "id": "intro_posture_standing",
+      "displayLabel": "Debout, à hauteur",
+      "level": 5,
+      "branches": ["obeissance"],
+      "requires": ["basics"],
+      "unlocks": ["posture_standing"],
+      "sequence": [
+        {
+          "time": 0,
+          "text": "Cette fois tu te mets debout. Jambes écartées, bien stable. Tu vas travailler dans cette position.",
+          "mode": "breath",
+          "duration": 8
+        },
+        {
+          "time": 8,
+          "text": "Debout, tu te penches et tu me prends. Vas-y.",
+          "mode": "rhythm",
+          "from": "tip",
+          "to": "head",
+          "bpm": 85,
+          "duration": 16
+        },
+        {
+          "time": 24,
+          "text": "Reste debout, ne fléchis pas. Continue.",
+          "mode": "rhythm",
+          "from": "head",
+          "to": "mid",
+          "bpm": 90,
+          "duration": 16
+        },
+        {
+          "time": 40,
+          "text": "Souffle. Tu tiens debout.",
+          "mode": "breath",
+          "duration": 6
+        },
+        {
+          "time": 46,
+          "text": "Encore. Jambes stables, et tu donnes tout.",
+          "mode": "lick",
+          "from": "head",
+          "to": "mid",
+          "bpm": 75,
+          "duration": 18
+        },
+        {
+          "time": 64,
+          "text": "Bien. Position debout acquise.",
+          "mode": "breath",
+          "duration": 8
+        }
+      ]
+    },
+    {
+      "id": "intro_posture_kneeling",
+      "displayLabel": "À genoux",
+      "level": 6,
+      "branches": ["obeissance"],
+      "requires": ["basics"],
+      "unlocks": ["posture_kneeling"],
+      "sequence": [
+        {
+          "time": 0,
+          "text": "Mets-toi à genoux. C'est ta place. Genoux au sol, dos droit, bouche prête.",
+          "mode": "breath",
+          "duration": 8
+        },
+        {
+          "time": 8,
+          "text": "À genoux devant moi, tu me prends. Lève les yeux.",
+          "mode": "rhythm",
+          "from": "tip",
+          "to": "mid",
+          "bpm": 90,
+          "duration": 16
+        },
+        {
+          "time": 24,
+          "text": "Reste à genoux. Ne bouge pas de là. Continue.",
+          "mode": "rhythm",
+          "from": "head",
+          "to": "mid",
+          "bpm": 95,
+          "duration": 16
+        },
+        {
+          "time": 40,
+          "text": "Souffle. Toujours à genoux.",
+          "mode": "breath",
+          "duration": 6
+        },
+        {
+          "time": 46,
+          "text": "Encore. Genoux au sol, tu me sers.",
+          "mode": "rhythm",
+          "from": "head",
+          "to": "mid",
+          "bpm": 100,
+          "duration": 18
+        },
+        {
+          "time": 64,
+          "text": "Bien. À genoux, c'est là que tu es le mieux. Tu le sais maintenant.",
+          "mode": "breath",
+          "duration": 8
+        }
+      ]
+    },
+    {
+      "id": "intro_posture_all_fours",
+      "displayLabel": "À quatre pattes",
+      "level": 9,
+      "branches": ["obeissance", "sloppy"],
+      "requires": ["basics"],
+      "unlocks": ["posture_all_fours"],
+      "sequence": [
+        {
+          "time": 0,
+          "text": "À quatre pattes. Maintenant. Mains et genoux au sol, croupe relevée, tête baissée.",
+          "mode": "breath",
+          "duration": 8
+        },
+        {
+          "time": 8,
+          "text": "Dans cette position, tu avances la bouche et tu me prends. Vas-y.",
+          "mode": "rhythm",
+          "from": "head",
+          "to": "mid",
+          "bpm": 95,
+          "duration": 16
+        },
+        {
+          "time": 24,
+          "text": "Reste à quatre pattes. Ne te relève pas. Plus profond.",
+          "mode": "rhythm",
+          "from": "head",
+          "to": "throat",
+          "bpm": 100,
+          "duration": 16
+        },
+        {
+          "time": 40,
+          "text": "Souffle. Garde la position à quatre pattes.",
+          "mode": "breath",
+          "duration": 6
+        },
+        {
+          "time": 46,
+          "text": "Encore. Croupe haute, et tu bosses comme la chienne que tu es.",
+          "mode": "rhythm",
+          "from": "head",
+          "to": "throat",
+          "bpm": 105,
+          "duration": 18
+        },
+        {
+          "time": 64,
+          "text": "Bien. À quatre pattes, soumise. Voilà ta position.",
+          "mode": "breath",
+          "duration": 8
+        }
+      ]
+    },
+    {
+      "id": "intro_posture_on_back",
+      "displayLabel": "Sur le dos, gorge offerte",
+      "level": 12,
+      "branches": ["obeissance", "profondeur"],
+      "requires": ["full_hold"],
+      "unlocks": ["posture_on_back"],
+      "requiresCapability": [{ "axis": "hold.full.streak", "min": 5 }],
+      "sequence": [
+        {
+          "time": 0,
+          "text": "Allonge-toi sur le dos. Tête en arrière, dans le vide. Ta gorge est alignée — tu vas tout prendre.",
+          "mode": "breath",
+          "duration": 8
+        },
+        {
+          "time": 8,
+          "text": "Sur le dos, gorge ouverte, tu me laisses entrer. Doucement.",
+          "mode": "rhythm",
+          "from": "mid",
+          "to": "throat",
+          "bpm": 90,
+          "duration": 16
+        },
+        {
+          "time": 24,
+          "text": "Reste sur le dos. Ne relève pas la tête. Plus loin.",
+          "mode": "hold",
+          "from": "full",
+          "duration": 10
+        },
+        {
+          "time": 34,
+          "text": "Tiens. Ta gorge est faite pour ça dans cette position.",
+          "mode": "hold",
+          "from": "full",
+          "duration": 12
+        },
+        {
+          "time": 46,
+          "text": "Souffle. Reste allongée.",
+          "mode": "breath",
+          "duration": 8
+        },
+        {
+          "time": 54,
+          "text": "Encore. Sur le dos, gorge grande ouverte, tu me prends jusqu'au fond.",
+          "mode": "rhythm",
+          "from": "throat",
+          "to": "full",
+          "bpm": 95,
+          "duration": 16
+        },
+        {
+          "time": 70,
+          "text": "Bien. Sur le dos, tu n'es plus qu'une gorge. Tu connais cette position maintenant.",
+          "mode": "breath",
+          "duration": 8
+        }
+      ]
+    },
     {
       "id": "intro_final_hold_tip",
       "displayLabel": "Apothéose — sauce sur la langue",
diff --git a/rhythm_coach/assets/career/milestones/intro_posture_all_fours_de.json b/rhythm_coach/assets/career/milestones/intro_posture_all_fours_de.json
new file mode 100644
index 0000000..7253570
--- /dev/null
+++ b/rhythm_coach/assets/career/milestones/intro_posture_all_fours_de.json
@@ -0,0 +1,11 @@
+{
+  "displayLabel": "Auf alle viere",
+  "stepTexts": {
+    "0": "Auf alle viere. Sofort. Hände und Knie auf dem Boden, Hintern hoch, Kopf runter.",
+    "8": "In dieser Stellung bringst du den Mund nach vorn und nimmst mich. Los.",
+    "24": "Bleib auf allen vieren. Steh nicht auf. Tiefer.",
+    "40": "Atme. Bleib auf allen vieren.",
+    "46": "Nochmal. Hintern hoch, und du arbeitest wie die Schlampe, die du bist.",
+    "64": "Gut. Auf allen vieren, unterwürfig. Das ist deine Stellung."
+  }
+}
diff --git a/rhythm_coach/assets/career/milestones/intro_posture_all_fours_en.json b/rhythm_coach/assets/career/milestones/intro_posture_all_fours_en.json
new file mode 100644
index 0000000..cf5fc74
--- /dev/null
+++ b/rhythm_coach/assets/career/milestones/intro_posture_all_fours_en.json
@@ -0,0 +1,11 @@
+{
+  "displayLabel": "On all fours",
+  "stepTexts": {
+    "0": "On all fours. Now. Hands and knees on the floor, rump up, head down.",
+    "8": "In that position, you bring your mouth forward and take me. Go on.",
+    "24": "Stay on all fours. Don't get up. Deeper.",
+    "40": "Breathe. Keep the all-fours position.",
+    "46": "Again. Rump high, and you work like the bitch you are.",
+    "64": "Good. On all fours, submissive. That's your position."
+  }
+}
diff --git a/rhythm_coach/assets/career/milestones/intro_posture_all_fours_es.json b/rhythm_coach/assets/career/milestones/intro_posture_all_fours_es.json
new file mode 100644
index 0000000..7c3372a
--- /dev/null
+++ b/rhythm_coach/assets/career/milestones/intro_posture_all_fours_es.json
@@ -0,0 +1,11 @@
+{
+  "displayLabel": "A cuatro patas",
+  "stepTexts": {
+    "0": "A cuatro patas. Ahora. Manos y rodillas en el suelo, culo en alto, cabeza abajo.",
+    "8": "En esa postura, adelantas la boca y me tomas. Adelante.",
+    "24": "Quédate a cuatro patas. No te levantes. Más hondo.",
+    "40": "Respira. Mantén la postura a cuatro patas.",
+    "46": "Otra vez. Culo en alto, y trabajas como la perra que eres.",
+    "64": "Bien. A cuatro patas, sumisa. Esa es tu postura."
+  }
+}
diff --git a/rhythm_coach/assets/career/milestones/intro_posture_kneeling_de.json b/rhythm_coach/assets/career/milestones/intro_posture_kneeling_de.json
new file mode 100644
index 0000000..0229ba5
--- /dev/null
+++ b/rhythm_coach/assets/career/milestones/intro_posture_kneeling_de.json
@@ -0,0 +1,11 @@
+{
+  "displayLabel": "Auf die Knie",
+  "stepTexts": {
+    "0": "Geh auf die Knie. Das ist dein Platz. Knie auf dem Boden, Rücken gerade, Mund bereit.",
+    "8": "Auf den Knien vor mir nimmst du mich. Schau hoch.",
+    "24": "Bleib auf den Knien. Beweg dich nicht weg. Mach weiter.",
+    "40": "Atme. Immer noch auf den Knien.",
+    "46": "Nochmal. Knie auf dem Boden, du dienst mir.",
+    "64": "Gut. Auf den Knien bist du am besten. Jetzt weißt du es."
+  }
+}
diff --git a/rhythm_coach/assets/career/milestones/intro_posture_kneeling_en.json b/rhythm_coach/assets/career/milestones/intro_posture_kneeling_en.json
new file mode 100644
index 0000000..a074492
--- /dev/null
+++ b/rhythm_coach/assets/career/milestones/intro_posture_kneeling_en.json
@@ -0,0 +1,11 @@
+{
+  "displayLabel": "On your knees",
+  "stepTexts": {
+    "0": "Get on your knees. That's your place. Knees on the floor, back straight, mouth ready.",
+    "8": "On your knees in front of me, you take me. Look up.",
+    "24": "Stay on your knees. Don't move from there. Keep going.",
+    "40": "Breathe. Still on your knees.",
+    "46": "Again. Knees on the floor, you serve me.",
+    "64": "Good. On your knees is where you're best. You know it now."
+  }
+}
diff --git a/rhythm_coach/assets/career/milestones/intro_posture_kneeling_es.json b/rhythm_coach/assets/career/milestones/intro_posture_kneeling_es.json
new file mode 100644
index 0000000..a405743
--- /dev/null
+++ b/rhythm_coach/assets/career/milestones/intro_posture_kneeling_es.json
@@ -0,0 +1,11 @@
+{
+  "displayLabel": "De rodillas",
+  "stepTexts": {
+    "0": "Ponte de rodillas. Ese es tu sitio. Rodillas en el suelo, espalda recta, boca lista.",
+    "8": "De rodillas ante mí, me tomas. Levanta la mirada.",
+    "24": "Quédate de rodillas. No te muevas de ahí. Continúa.",
+    "40": "Respira. Sigues de rodillas.",
+    "46": "Otra vez. Rodillas en el suelo, me sirves.",
+    "64": "Bien. De rodillas es donde mejor estás. Ya lo sabes."
+  }
+}
diff --git a/rhythm_coach/assets/career/milestones/intro_posture_on_back_de.json b/rhythm_coach/assets/career/milestones/intro_posture_on_back_de.json
new file mode 100644
index 0000000..a5386b9
--- /dev/null
+++ b/rhythm_coach/assets/career/milestones/intro_posture_on_back_de.json
@@ -0,0 +1,12 @@
+{
+  "displayLabel": "Auf dem Rücken, Kehle dargeboten",
+  "stepTexts": {
+    "0": "Leg dich auf den Rücken. Kopf nach hinten, über die Kante. Deine Kehle ist ausgerichtet — du nimmst alles.",
+    "8": "Auf dem Rücken, Kehle offen, lässt du mich rein. Langsam.",
+    "24": "Bleib auf dem Rücken. Heb den Kopf nicht. Weiter.",
+    "34": "Halt. Deine Kehle ist in dieser Stellung dafür gemacht.",
+    "46": "Atme. Bleib liegen.",
+    "54": "Nochmal. Auf dem Rücken, Kehle weit offen, du nimmst mich bis zum Grund.",
+    "70": "Gut. Auf dem Rücken bist du nur noch eine Kehle. Jetzt kennst du diese Stellung."
+  }
+}
diff --git a/rhythm_coach/assets/career/milestones/intro_posture_on_back_en.json b/rhythm_coach/assets/career/milestones/intro_posture_on_back_en.json
new file mode 100644
index 0000000..398255b
--- /dev/null
+++ b/rhythm_coach/assets/career/milestones/intro_posture_on_back_en.json
@@ -0,0 +1,12 @@
+{
+  "displayLabel": "On your back, throat offered",
+  "stepTexts": {
+    "0": "Lie down on your back. Head tipped back, over the edge. Your throat is lined up — you're going to take it all.",
+    "8": "On your back, throat open, you let me in. Slowly.",
+    "24": "Stay on your back. Don't lift your head. Further.",
+    "34": "Hold. Your throat is made for this in this position.",
+    "46": "Breathe. Stay lying down.",
+    "54": "Again. On your back, throat wide open, you take me to the root.",
+    "70": "Good. On your back, you're nothing but a throat. You know this position now."
+  }
+}
diff --git a/rhythm_coach/assets/career/milestones/intro_posture_on_back_es.json b/rhythm_coach/assets/career/milestones/intro_posture_on_back_es.json
new file mode 100644
index 0000000..de9c0be
--- /dev/null
+++ b/rhythm_coach/assets/career/milestones/intro_posture_on_back_es.json
@@ -0,0 +1,12 @@
+{
+  "displayLabel": "Boca arriba, garganta ofrecida",
+  "stepTexts": {
+    "0": "Túmbate boca arriba. La cabeza hacia atrás, fuera del borde. Tu garganta queda alineada — vas a tomarlo todo.",
+    "8": "Boca arriba, garganta abierta, me dejas entrar. Despacio.",
+    "24": "Quédate boca arriba. No levantes la cabeza. Más adentro.",
+    "34": "Aguanta. Tu garganta está hecha para esto en esta postura.",
+    "46": "Respira. Sigue tumbada.",
+    "54": "Otra vez. Boca arriba, garganta bien abierta, me tomas hasta el fondo.",
+    "70": "Bien. Boca arriba, no eres más que una garganta. Ya conoces esta postura."
+  }
+}
diff --git a/rhythm_coach/assets/career/milestones/intro_posture_sitting_de.json b/rhythm_coach/assets/career/milestones/intro_posture_sitting_de.json
new file mode 100644
index 0000000..6c935b7
--- /dev/null
+++ b/rhythm_coach/assets/career/milestones/intro_posture_sitting_de.json
@@ -0,0 +1,11 @@
+{
+  "displayLabel": "Setz dich und öffne dich",
+  "stepTexts": {
+    "0": "Heute gehorchst du einer Stellungsanweisung. Setz dich gerade hin, spreiz die Knie und präsentier dich.",
+    "8": "In dieser Stellung nimmst du mich in den Mund. Fang langsam an.",
+    "24": "Bleib sitzen, Rücken gerade. Mach weiter.",
+    "40": "Atme. Bleib in der Stellung.",
+    "46": "Nochmal. Du bleibst sitzen, dargeboten, und du arbeitest.",
+    "64": "Gut. Das ist deine sitzende Stellung. Jetzt kennst du sie."
+  }
+}
diff --git a/rhythm_coach/assets/career/milestones/intro_posture_sitting_en.json b/rhythm_coach/assets/career/milestones/intro_posture_sitting_en.json
new file mode 100644
index 0000000..5ac2d17
--- /dev/null
+++ b/rhythm_coach/assets/career/milestones/intro_posture_sitting_en.json
@@ -0,0 +1,11 @@
+{
+  "displayLabel": "Sit down and open up",
+  "stepTexts": {
+    "0": "Today you obey a position order. Sit up straight, spread your knees, and present yourself.",
+    "8": "In that position, you take me in your mouth. Start slow.",
+    "24": "Stay seated, back straight. Keep going.",
+    "40": "Breathe. Hold the position.",
+    "46": "Again. You stay seated, offered, and you work.",
+    "64": "Good. That's your sitting position. You know it now."
+  }
+}
diff --git a/rhythm_coach/assets/career/milestones/intro_posture_sitting_es.json b/rhythm_coach/assets/career/milestones/intro_posture_sitting_es.json
new file mode 100644
index 0000000..1b5e95f
--- /dev/null
+++ b/rhythm_coach/assets/career/milestones/intro_posture_sitting_es.json
@@ -0,0 +1,11 @@
+{
+  "displayLabel": "Siéntate y ábrete",
+  "stepTexts": {
+    "0": "Hoy obedeces una orden de postura. Siéntate bien recta, abre las rodillas y preséntate.",
+    "8": "En esa postura, me tomas en la boca. Empieza despacio.",
+    "24": "Sigue sentada, espalda recta. Continúa.",
+    "40": "Respira. Mantén la postura.",
+    "46": "Otra vez. Te quedas sentada, ofrecida, y trabajas.",
+    "64": "Bien. Esa es tu postura sentada. Ya la conoces."
+  }
+}
diff --git a/rhythm_coach/assets/career/milestones/intro_posture_standing_de.json b/rhythm_coach/assets/career/milestones/intro_posture_standing_de.json
new file mode 100644
index 0000000..4e0e2d2
--- /dev/null
+++ b/rhythm_coach/assets/career/milestones/intro_posture_standing_de.json
@@ -0,0 +1,11 @@
+{
+  "displayLabel": "Stehend, auf der richtigen Höhe",
+  "stepTexts": {
+    "0": "Diesmal stellst du dich hin. Beine auseinander, schön stabil. In dieser Stellung wirst du arbeiten.",
+    "8": "Im Stehen beugst du dich vor und nimmst mich. Los.",
+    "24": "Bleib auf den Beinen, knick nicht ein. Mach weiter.",
+    "40": "Atme. Du hältst dich aufrecht.",
+    "46": "Nochmal. Beine stabil, und du gibst alles.",
+    "64": "Gut. Stehende Stellung gelernt."
+  }
+}
diff --git a/rhythm_coach/assets/career/milestones/intro_posture_standing_en.json b/rhythm_coach/assets/career/milestones/intro_posture_standing_en.json
new file mode 100644
index 0000000..3ac1cfd
--- /dev/null
+++ b/rhythm_coach/assets/career/milestones/intro_posture_standing_en.json
@@ -0,0 +1,11 @@
+{
+  "displayLabel": "Standing, at the right height",
+  "stepTexts": {
+    "0": "This time you stand up. Legs apart, nice and stable. You're going to work in this position.",
+    "8": "Standing, you lean in and take me. Go on.",
+    "24": "Stay on your feet, don't buckle. Keep going.",
+    "40": "Breathe. You're holding upright.",
+    "46": "Again. Legs steady, and you give everything.",
+    "64": "Good. Standing position learned."
+  }
+}
diff --git a/rhythm_coach/assets/career/milestones/intro_posture_standing_es.json b/rhythm_coach/assets/career/milestones/intro_posture_standing_es.json
new file mode 100644
index 0000000..34315f8
--- /dev/null
+++ b/rhythm_coach/assets/career/milestones/intro_posture_standing_es.json
@@ -0,0 +1,11 @@
+{
+  "displayLabel": "De pie, a la altura justa",
+  "stepTexts": {
+    "0": "Esta vez te pones de pie. Piernas separadas, bien estable. Vas a trabajar en esta postura.",
+    "8": "De pie, te inclinas y me tomas. Adelante.",
+    "24": "Quédate de pie, no flaquees. Continúa.",
+    "40": "Respira. Te mantienes erguida.",
+    "46": "Otra vez. Piernas firmes, y lo das todo.",
+    "64": "Bien. Postura de pie aprendida."
+  }
+}
diff --git a/rhythm_coach/lib/career/models/posture_unlock.dart b/rhythm_coach/lib/career/models/posture_unlock.dart
new file mode 100644
index 0000000..b9632da
--- /dev/null
+++ b/rhythm_coach/lib/career/models/posture_unlock.dart
@@ -0,0 +1,33 @@
+import '../../models/posture.dart';
+import 'unlock_key.dart';
+
+/// Pont entre le modèle [Posture] (`lib/models/`, sans dépendance carrière) et
+/// l'enum carrière [UnlockKey]. Vit côté `career/` pour ne pas faire dépendre
+/// `models/` de `career/` (cf. `Posture.unlockKey`, qui renvoie une `String`).
+///
+/// Le `switch` explicite référence chaque `UnlockKey.posture*` littéralement —
+/// requis par l'invariant `test/milestone_unlock_invariants_test.dart` (scan
+/// textuel `UnlockKey.<name>` dans `/lib`) une fois les milestones
+/// `intro_posture_*` ajoutées au catalogue.
+extension PostureUnlock on Posture {
+  /// Clé d'unlock carrière de cette posture, ou `null` pour [Posture.free]
+  /// (toujours disponible, sans milestone).
+  UnlockKey? get unlockKeyEnum => switch (this) {
+        Posture.free => null,
+        Posture.sitting => UnlockKey.postureSitting,
+        Posture.standing => UnlockKey.postureStanding,
+        Posture.kneeling => UnlockKey.postureKneeling,
+        Posture.allFours => UnlockKey.postureAllFours,
+        Posture.onBack => UnlockKey.postureOnBack,
+      };
+}
+
+/// Postures que l'utilisatrice peut se voir imposer, compte tenu des unlocks
+/// acquis. [Posture.free] est toujours incluse (jamais débloquée). L'ordre
+/// suit `Posture.values` (déterministe). Sert au tirage de la posture d'intro
+/// et des postures de break (cf. spec `specs/scripted_breaks.md`).
+List<Posture> availablePostures(Set<UnlockKey> unlockedKeys) => [
+      Posture.free,
+      for (final p in Posture.values)
+        if (p != Posture.free && unlockedKeys.contains(p.unlockKeyEnum)) p,
+    ];
diff --git a/rhythm_coach/lib/career/models/unlock_key.dart b/rhythm_coach/lib/career/models/unlock_key.dart
index 44747ef..da94b58 100644
--- a/rhythm_coach/lib/career/models/unlock_key.dart
+++ b/rhythm_coach/lib/career/models/unlock_key.dart
@@ -102,7 +102,17 @@ enum UnlockKey {
   // et `suckleBalls` (zone humil pure, level 10-11, gating anatomy en
   // plus côté MilestoneService).
   suckleHead,
-  suckleBalls;
+  suckleBalls,
+  // Postures physiques imposées (mise en scène, issue #77). Chacune est
+  // débloquée par sa milestone d'introduction dédiée (`intro_posture_*`) et
+  // consommée par le générateur via `availablePostures(unlockedKeys)`
+  // (`posture_unlock.dart`) pour tirer la posture d'intro / de break.
+  // `Posture.free` (« confort, au choix ») n'a pas de clé — toujours dispo.
+  postureSitting,
+  postureStanding,
+  postureKneeling,
+  postureAllFours,
+  postureOnBack;
 
   String get serialized => switch (this) {
         UnlockKey.basics => 'basics',
@@ -139,6 +149,11 @@ enum UnlockKey {
         UnlockKey.begBalls => 'beg_balls',
         UnlockKey.suckleHead => 'suckle_head',
         UnlockKey.suckleBalls => 'suckle_balls',
+        UnlockKey.postureSitting => 'posture_sitting',
+        UnlockKey.postureStanding => 'posture_standing',
+        UnlockKey.postureKneeling => 'posture_kneeling',
+        UnlockKey.postureAllFours => 'posture_all_fours',
+        UnlockKey.postureOnBack => 'posture_on_back',
       };
 
   static UnlockKey? fromString(String? raw) {
diff --git a/rhythm_coach/test/posture_unlock_test.dart b/rhythm_coach/test/posture_unlock_test.dart
new file mode 100644
index 0000000..2e934d3
--- /dev/null
+++ b/rhythm_coach/test/posture_unlock_test.dart
@@ -0,0 +1,58 @@
+import 'package:beat_bitch/career/models/posture_unlock.dart';
+import 'package:beat_bitch/career/models/unlock_key.dart';
+import 'package:beat_bitch/models/posture.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('PostureUnlock — Posture ↔ UnlockKey', () {
+    test('free n\'a pas de clé enum, les autres oui', () {
+      expect(Posture.free.unlockKeyEnum, isNull);
+      for (final p in Posture.values.where((p) => p != Posture.free)) {
+        expect(p.unlockKeyEnum, isNotNull,
+            reason: '$p doit mapper une UnlockKey');
+      }
+    });
+
+    test('unlockKeyEnum.serialized cohérent avec Posture.unlockKey (String)',
+        () {
+      for (final p in Posture.values) {
+        expect(p.unlockKeyEnum?.serialized, p.unlockKey,
+            reason: 'le pont enum doit produire la même clé que le modèle');
+      }
+    });
+  });
+
+  group('availablePostures', () {
+    test('free seule quand aucun unlock', () {
+      expect(availablePostures({}), [Posture.free]);
+    });
+
+    test('inclut une posture débloquée, free toujours en tête', () {
+      final result = availablePostures({UnlockKey.postureKneeling});
+      expect(result, contains(Posture.kneeling));
+      expect(result.first, Posture.free);
+      expect(result, isNot(contains(Posture.allFours)));
+    });
+
+    test('toutes débloquées = toutes les postures', () {
+      final all = {
+        for (final p in Posture.values)
+          if (p.unlockKeyEnum != null) p.unlockKeyEnum!,
+      };
+      expect(availablePostures(all).toSet(), Posture.values.toSet());
+    });
+
+    test('ignore les unlocks non-posture', () {
+      expect(availablePostures({UnlockKey.lickBalls, UnlockKey.throatHold}),
+          [Posture.free]);
+    });
+
+    test('ordre déterministe = ordre de Posture.values', () {
+      final result = availablePostures({
+        UnlockKey.postureOnBack,
+        UnlockKey.postureSitting,
+      });
+      expect(result, [Posture.free, Posture.sitting, Posture.onBack]);
+    });
+  });
+}