diff --git a/src/public/index.html b/src/public/index.html
index 578fd6a..f4cd5f1 100644
--- a/src/public/index.html
+++ b/src/public/index.html
@@ -232,6 +232,11 @@
       color: var(--gray);
       display: block;
     }
+    .hint {
+      font-size: 0.8rem;
+      color: var(--gray);
+      font-weight: 400;
+    }
 
     /* Checkbox group */
     .checkbox-group {
@@ -1159,47 +1164,47 @@
     <!-- Step 3: Yasam Tarzi -->
     <div id="profileStep3" class="hidden">
       <div class="form-group">
-        <label>Hedef</label>
-        <div class="radio-group">
+        <label>Hedef <span class="hint">(birden fazla secilebilir)</span></label>
+        <div class="checkbox-group">
           <label>
-            <input type="radio" name="profGoal" value="lose_weight">
+            <input type="checkbox" name="profGoal" value="lose_weight">
             <span>Kilo Vermek</span>
           </label>
           <label>
-            <input type="radio" name="profGoal" value="gain_weight">
+            <input type="checkbox" name="profGoal" value="gain_weight">
             <span>Kilo Almak</span>
           </label>
           <label>
-            <input type="radio" name="profGoal" value="build_muscle">
+            <input type="checkbox" name="profGoal" value="build_muscle">
             <span>Kas Gelistirmek</span>
           </label>
           <label>
-            <input type="radio" name="profGoal" value="maintain">
+            <input type="checkbox" name="profGoal" value="maintain">
             <span>Formu Korumak</span>
           </label>
         </div>
       </div>
       <div class="form-group">
-        <label>Aktivite Seviyesi</label>
-        <div class="radio-group">
+        <label>Aktivite Seviyesi <span class="hint">(birden fazla secilebilir)</span></label>
+        <div class="checkbox-group">
           <label>
-            <input type="radio" name="profActivity" value="sedentary">
+            <input type="checkbox" name="profActivity" value="sedentary">
             <span>Hareketsiz<span class="radio-desc">Masa basi is, az hareket</span></span>
           </label>
           <label>
-            <input type="radio" name="profActivity" value="light">
+            <input type="checkbox" name="profActivity" value="light">
             <span>Hafif<span class="radio-desc">Haftada 1-2 gun hafif egzersiz</span></span>
           </label>
           <label>
-            <input type="radio" name="profActivity" value="moderate">
+            <input type="checkbox" name="profActivity" value="moderate">
             <span>Orta<span class="radio-desc">Haftada 3-5 gun egzersiz</span></span>
           </label>
           <label>
-            <input type="radio" name="profActivity" value="active">
+            <input type="checkbox" name="profActivity" value="active">
             <span>Aktif<span class="radio-desc">Haftada 6-7 gun egzersiz</span></span>
           </label>
           <label>
-            <input type="radio" name="profActivity" value="very_active">
+            <input type="checkbox" name="profActivity" value="very_active">
             <span>Cok Aktif<span class="radio-desc">Gunde 2 antrenman veya agir fiziksel is</span></span>
           </label>
         </div>
@@ -1414,18 +1419,17 @@
       <div id="injuryFields" class="cond-fields hidden">
         <div class="form-row">
           <div class="form-group">
-            <label>Sakatlik Bolgesi</label>
-            <select id="profInjuryArea">
-              <option value="none">Seciniz</option>
-              <option value="knee">Diz</option>
-              <option value="back">Sirt / Bel</option>
-              <option value="shoulder">Omuz</option>
-              <option value="elbow">Dirsek</option>
-              <option value="wrist">Bilek</option>
-              <option value="ankle">Ayak Bilegi</option>
-              <option value="hip">Kalca</option>
-              <option value="neck">Boyun</option>
-            </select>
+            <label>Sakatlik Bolgesi <span class="hint">(birden fazla secilebilir)</span></label>
+            <div class="checkbox-group">
+              <label><input type="checkbox" name="profInjuryArea" value="knee"><span>Diz</span></label>
+              <label><input type="checkbox" name="profInjuryArea" value="back"><span>Sirt / Bel</span></label>
+              <label><input type="checkbox" name="profInjuryArea" value="shoulder"><span>Omuz</span></label>
+              <label><input type="checkbox" name="profInjuryArea" value="elbow"><span>Dirsek</span></label>
+              <label><input type="checkbox" name="profInjuryArea" value="wrist"><span>Bilek</span></label>
+              <label><input type="checkbox" name="profInjuryArea" value="ankle"><span>Ayak Bilegi</span></label>
+              <label><input type="checkbox" name="profInjuryArea" value="hip"><span>Kalca</span></label>
+              <label><input type="checkbox" name="profInjuryArea" value="neck"><span>Boyun</span></label>
+            </div>
           </div>
           <div class="form-group">
             <label>Sakatlik Siddeti</label>
@@ -2133,8 +2137,14 @@ function populateProfileForm(p) {
   setRadioValue('bodyType', p.body_type);
 
   // Step 3
-  setRadioValue('profGoal', p.goal);
-  setRadioValue('profActivity', p.activity_level);
+  if (p.goal) {
+    var goals = typeof p.goal === 'string' ? p.goal.split(',').map(function(s){return s.trim();}) : [p.goal];
+    setCheckedValues('profGoal', goals);
+  }
+  if (p.activity_level) {
+    var activities = typeof p.activity_level === 'string' ? p.activity_level.split(',').map(function(s){return s.trim();}) : [p.activity_level];
+    setCheckedValues('profActivity', activities);
+  }
   if (p.job_type) document.getElementById('profJobType').value = p.job_type;
   if (p.sleep_hours) document.getElementById('profSleep').value = p.sleep_hours;
   setRadioValue('sleepQuality', p.sleep_quality);
@@ -2170,7 +2180,10 @@ function populateProfileForm(p) {
   if (p.has_injury) {
     document.getElementById('profHasInjury').checked = true;
     toggleInjuryFields();
-    if (p.injury_area) document.getElementById('profInjuryArea').value = p.injury_area;
+    if (p.injury_area) {
+      var areas = typeof p.injury_area === 'string' ? p.injury_area.split(',').map(function(s){return s.trim();}) : [p.injury_area];
+      setCheckedValues('profInjuryArea', areas);
+    }
     setRadioValue('injurySeverity', p.injury_severity);
     if (p.injury_notes) document.getElementById('profInjuryNotes').value = p.injury_notes;
   }
@@ -2289,8 +2302,8 @@ async function saveProfile() {
       body_type: getRadioValue('bodyType') || null,
 
       // Step 3
-      goal: getRadioValue('profGoal'),
-      activity_level: getRadioValue('profActivity'),
+      goal: getCheckedValues('profGoal').join(','),
+      activity_level: getCheckedValues('profActivity').join(','),
       job_type: document.getElementById('profJobType').value || null,
       sleep_hours: parseFloat(document.getElementById('profSleep').value) || null,
       sleep_quality: getRadioValue('sleepQuality') || null,
@@ -2310,7 +2323,7 @@ async function saveProfile() {
 
       // Step 5
       has_injury: document.getElementById('profHasInjury').checked ? 1 : 0,
-      injury_area: document.getElementById('profInjuryArea').value || 'none',
+      injury_area: getCheckedValues('profInjuryArea').join(',') || 'none',
       injury_severity: getRadioValue('injurySeverity') || null,
       injury_notes: document.getElementById('profInjuryNotes').value || null,
       has_disability: document.getElementById('profHasDisability').checked ? 1 : 0,
@@ -2371,7 +2384,7 @@ async function saveProfile() {
   } catch (err) {
     errEl.textContent = err.message;
     errEl.style.display = 'block';
-    profileNextStep(1);
+    window.scrollTo({ top: 0, behavior: 'smooth' });
   } finally {
     btn.disabled = false;
     btn.textContent = 'Programimi Olustur';
diff --git a/src/routes/profile.js b/src/routes/profile.js
index 171630f..c202fd7 100644
--- a/src/routes/profile.js
+++ b/src/routes/profile.js
@@ -72,6 +72,17 @@ function validateEnum(value, validValues, fieldName) {
   return null;
 }
 
+function validateMultiEnum(value, validValues, fieldName) {
+  if (value === undefined || value === null || value === "") return null;
+  const parts = String(value).split(",").map((s) => s.trim()).filter(Boolean);
+  for (const part of parts) {
+    if (!validValues.includes(part)) {
+      return `Invalid ${fieldName} value: ${part}`;
+    }
+  }
+  return null;
+}
+
 function validateNumber(value, min, max, fieldName) {
   if (value !== undefined && value !== null && value !== "") {
     const num = Number(value);
@@ -90,8 +101,8 @@ function validate(body) {
     validateNumber(body.height, 50, 300, "Height"),
     validateNumber(body.weight, 20, 500, "Weight"),
     // Optional enums
-    validateEnum(body.activity_level, VALID_ACTIVITY_LEVELS, "activity_level"),
-    validateEnum(body.goal, VALID_GOALS, "goal"),
+    validateMultiEnum(body.activity_level, VALID_ACTIVITY_LEVELS, "activity_level"),
+    validateMultiEnum(body.goal, VALID_GOALS, "goal"),
     validateEnum(body.body_type, VALID_BODY_TYPES, "body_type"),
     validateEnum(body.stress_level, VALID_STRESS_LEVELS, "stress_level"),
     validateEnum(body.sleep_quality, VALID_SLEEP_QUALITY, "sleep_quality"),
@@ -100,7 +111,7 @@ function validate(body) {
     validateEnum(body.workout_location, VALID_WORKOUT_LOCATIONS, "workout_location"),
     validateEnum(body.fitness_goal, VALID_FITNESS_GOALS, "fitness_goal"),
     validateEnum(body.cardio_preference, VALID_CARDIO_PREFERENCES, "cardio_preference"),
-    validateEnum(body.injury_area, VALID_INJURY_AREAS, "injury_area"),
+    validateMultiEnum(body.injury_area, VALID_INJURY_AREAS, "injury_area"),
     validateEnum(body.injury_severity, VALID_INJURY_SEVERITY, "injury_severity"),
     validateEnum(body.disability_type, VALID_DISABILITY_TYPES, "disability_type"),
     validateEnum(body.mobility_level, VALID_MOBILITY_LEVELS, "mobility_level"),
diff --git a/src/services/dietitian.js b/src/services/dietitian.js
index e42c529..75cfe1f 100644
--- a/src/services/dietitian.js
+++ b/src/services/dietitian.js
@@ -58,24 +58,23 @@ const ACTIVITY_MULTIPLIERS = {
 };
 
 function calculateTDEE(bmr, activityLevel) {
-  return bmr * (ACTIVITY_MULTIPLIERS[activityLevel] || 1.55);
+  // Support comma-separated multi-select: use highest multiplier
+  const levels = String(activityLevel).split(",").map((s) => s.trim()).filter(Boolean);
+  const multipliers = levels.map((lvl) => ACTIVITY_MULTIPLIERS[lvl]).filter(Boolean);
+  const multiplier = multipliers.length > 0 ? Math.max(...multipliers) : 1.55;
+  return bmr * multiplier;
 }
 
 function adjustCaloriesForGoal(tdee, goal) {
   let calories = tdee;
-  switch (goal) {
-    case "lose_weight":
-      calories -= 500;
-      break;
-    case "gain_weight":
-      calories += 500;
-      break;
-    case "build_muscle":
-      calories += 300;
-      break;
-    case "maintain":
-    default:
-      break;
+  const goals = String(goal).split(",").map((s) => s.trim());
+  // Apply the first matching goal adjustment (priority order)
+  if (goals.includes("lose_weight")) {
+    calories -= 500;
+  } else if (goals.includes("gain_weight")) {
+    calories += 500;
+  } else if (goals.includes("build_muscle")) {
+    calories += 300;
   }
   // Never exceed a 20% deficit
   const minAllowed = tdee * 0.8;
@@ -156,8 +155,9 @@ function selectDietType(profile) {
   if (profile.has_diabetes) return "diabetic_friendly";
   if (profile.heart_condition || profile.blood_pressure === "high") return "heart_healthy";
   if (profile.has_arthritis || profile.has_fibromyalgia) return "anti_inflammatory";
-  if (goal === "lose_weight") return "calorie_deficit";
-  if (goal === "build_muscle") return "high_protein";
+  const goals = goal.split(",").map((s) => s.trim());
+  if (goals.includes("lose_weight")) return "calorie_deficit";
+  if (goals.includes("build_muscle")) return "high_protein";
   if (profile.workout_location === "none") return "balanced";
   if (profile.post_surgery || profile.rehabilitation) return "recovery_gentle";
 
@@ -318,7 +318,7 @@ function getSupplements(profile, dietType) {
     rationale: "Supports bone health, immune function, and mood regulation",
   });
 
-  if (profile.goal === "build_muscle" || dietType === "high_protein") {
+  if ((profile.goal || "").split(",").map((s) => s.trim()).includes("build_muscle") || dietType === "high_protein") {
     supplements.push({
       name: "Whey Protein (or plant-based protein)",
       dosage: "25-30g post-workout",
@@ -451,8 +451,10 @@ function getSupplements(profile, dietType) {
 function calculateWaterIntake(weight, activityLevel, goal) {
   // Base: 33ml per kg of body weight
   let water = (weight * 33) / 1000;
-  if (activityLevel === "active" || activityLevel === "very_active") water += 0.5;
-  if (goal === "lose_weight") water += 0.3;
+  const levels = String(activityLevel).split(",").map((s) => s.trim());
+  if (levels.includes("active") || levels.includes("very_active")) water += 0.5;
+  const goals = String(goal).split(",").map((s) => s.trim());
+  if (goals.includes("lose_weight")) water += 0.3;
   return Math.round(water * 10) / 10;
 }
 
diff --git a/src/services/trainer.js b/src/services/trainer.js
index f8fadd5..b669976 100644
--- a/src/services/trainer.js
+++ b/src/services/trainer.js
@@ -406,9 +406,16 @@ function pickRandom(arr, count) {
   return shuffled.slice(0, Math.min(count, arr.length));
 }
 
+function hasGoal(profile, goalValue) {
+  const goal = profile.goal || "maintain";
+  return goal.split(",").map((s) => s.trim()).includes(goalValue);
+}
+
 function filterByInjury(exercises, injuryArea) {
   if (!injuryArea || injuryArea === "none") return exercises;
-  return exercises.filter((e) => !e.contraindicated_injuries.includes(injuryArea));
+  const areas = String(injuryArea).split(",").map((s) => s.trim()).filter((s) => s && s !== "none");
+  if (areas.length === 0) return exercises;
+  return exercises.filter((e) => !areas.some((area) => e.contraindicated_injuries.includes(area)));
 }
 
 function filterByConditions(exercises, profile) {
@@ -743,7 +750,8 @@ function buildInjuryNote(profile) {
     mild: "mild", moderate: "moderate", severe: "severe",
   };
 
-  const areaName = areaNames[profile.injury_area] || profile.injury_area;
+  const areas = String(profile.injury_area).split(",").map((s) => s.trim()).filter((s) => s && s !== "none");
+  const areaName = areas.map((a) => areaNames[a] || a).join(", ");
   const severityName = severityNames[profile.injury_severity] || "mild";
   let note = `Program adapted for ${severityName} ${areaName} injury.`;
 
@@ -872,7 +880,7 @@ function buildCardioDay(dayNumber, dayName, focus, profile, week) {
   const bodyType = profile.body_type || "mesomorph";
   let exercises = [];
 
-  if ((bodyType === "endomorph" || profile.goal === "lose_weight") && !profile.heart_condition) {
+  if ((bodyType === "endomorph" || hasGoal(profile, "lose_weight")) && !profile.heart_condition) {
     const safeHiit = filterByLocation(filterByEquipment(filterByConditions(filterByInjury(EXERCISES.hiit, injuryArea), profile), profile), location);
     const safeCardio = filterByLocation(filterByEquipment(filterByConditions(filterByInjury(EXERCISES.cardio, injuryArea), profile), profile), location);
     exercises = [...pickRandom(safeHiit, 4), ...pickRandom(safeCardio, 1)];
@@ -1120,7 +1128,6 @@ function generateWheelchairProgram(profile, week) {
 // ─────────────────────────────────────────────────────────────────────────────
 
 function applyGoalAdjustments(days, profile, week) {
-  const goal = profile.goal || "maintain";
   const bodyType = profile.body_type || "mesomorph";
   const location = profile.workout_location || "gym";
 
@@ -1130,7 +1137,7 @@ function applyGoalAdjustments(days, profile, week) {
     let modified = { ...day, exercises: [...day.exercises] };
 
     // For lose_weight: add cardio to strength days
-    if (goal === "lose_weight" && day.type === "strength" && !profile.heart_condition) {
+    if (hasGoal(profile, "lose_weight") && day.type === "strength" && !profile.heart_condition) {
       const injuryArea = profile.has_injury ? (profile.injury_area || "none") : "none";
       let safeCardio = filterByLocation(filterByEquipment(filterByConditions(filterByInjury(EXERCISES.cardio, injuryArea), profile), profile), location);
       if (safeCardio.length > 0) {
@@ -1154,7 +1161,7 @@ function applyGoalAdjustments(days, profile, week) {
     }
 
     // Gain weight: remove excess cardio from strength days
-    if (goal === "gain_weight") {
+    if (hasGoal(profile, "gain_weight")) {
       modified.exercises = modified.exercises.filter((e) => {
         return !EXERCISES.cardio.some((c) => c.name === e.name);
       });
@@ -1165,11 +1172,10 @@ function applyGoalAdjustments(days, profile, week) {
 }
 
 function adjustCardioRestDays(days, profile, week) {
-  const goal = profile.goal || "maintain";
   const bodyType = profile.body_type || "mesomorph";
   let cardioDaysNeeded = 0;
 
-  if (goal === "lose_weight" && !profile.heart_condition) cardioDaysNeeded = 2;
+  if (hasGoal(profile, "lose_weight") && !profile.heart_condition) cardioDaysNeeded = 2;
   else if (bodyType === "endomorph" && !profile.heart_condition) cardioDaysNeeded = 1;
 
   let converted = 0;