diff --git a/apps/admin/src/app/api/profile/fitness/route.ts b/apps/admin/src/app/api/profile/fitness/route.ts
new file mode 100644
index 0000000..bb78ed5
--- /dev/null
+++ b/apps/admin/src/app/api/profile/fitness/route.ts
@@ -0,0 +1,66 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { users, fitnessProfiles } from '../../../../lib/database'
+
+export async function POST(request: NextRequest) {
+  try {
+    const profileData: FitnessProfile = await request.json()
+
+    if (!profileData.userId || !profileData.height || !profileData.weight || !profileData.age) {
+      return NextResponse.json(
+        { error: 'Missing required fields' },
+        { status: 400 }
+      )
+    }
+
+    // For demo purposes, we'll allow profile creation without strict user validation
+    // In production, you'd validate against a persistent database
+    console.log('Creating fitness profile for user ID:', profileData.userId)
+
+    const existingProfile = fitnessProfiles.find(p => p.userId === profileData.userId)
+    if (existingProfile) {
+      Object.assign(existingProfile, profileData)
+    } else {
+      fitnessProfiles.push(profileData)
+    }
+
+    return NextResponse.json(
+      { 
+        message: 'Fitness profile saved successfully',
+        profile: profileData
+      },
+      { status: 201 }
+    )
+  } catch (error) {
+    console.error('Fitness profile error:', error)
+    return NextResponse.json(
+      { error: 'Internal server error' },
+      { status: 500 }
+    )
+  }
+}
+
+export async function GET(request: NextRequest) {
+  try {
+    const { searchParams } = new URL(request.url)
+    const userId = searchParams.get('userId')
+
+    if (userId) {
+      const profile = fitnessProfiles.find(p => p.userId === userId)
+      if (!profile) {
+        return NextResponse.json(
+          { error: 'Profile not found' },
+          { status: 404 }
+        )
+      }
+      return NextResponse.json({ profile })
+    }
+
+    return NextResponse.json({ profiles: fitnessProfiles })
+  } catch (error) {
+    console.error('Get fitness profiles error:', error)
+    return NextResponse.json(
+      { error: 'Internal server error' },
+      { status: 500 }
+    )
+  }
+}
\ No newline at end of file
diff --git a/apps/admin/src/lib/database.ts b/apps/admin/src/lib/database.ts
index b9d86cc..4d88b05 100644
--- a/apps/admin/src/lib/database.ts
+++ b/apps/admin/src/lib/database.ts
@@ -18,6 +18,20 @@ export interface Client {
   joinDate: Date
 }
 
+export interface FitnessProfile {
+  userId: string
+  height: string
+  weight: string
+  age: string
+  gender: 'male' | 'female' | 'other'
+  activityLevel: 'sedentary' | 'light' | 'moderate' | 'active' | 'very_active'
+  fitnessGoals: string[]
+  exerciseHabits: string
+  dietHabits: string
+  medicalConditions: string
+}
+
 // In-memory database
 export const users: User[] = []
-export const clients: Client[] = []
\ No newline at end of file
+export const clients: Client[] = []
+export const fitnessProfiles: FitnessProfile[] = []
\ No newline at end of file
diff --git a/apps/mobile/src/app/login.tsx b/apps/mobile/src/app/login.tsx
index fc68429..b55c6e6 100644
--- a/apps/mobile/src/app/login.tsx
+++ b/apps/mobile/src/app/login.tsx
@@ -25,9 +25,31 @@ export default function LoginScreen() {
       
       if (response.data.user) {
         await SecureStore.setItemAsync('user', JSON.stringify(response.data.user))
-        Alert.alert('Success', 'Login successful!', [
-          { text: 'OK', onPress: () => router.replace('/(tabs)') }
-        ])
+        
+        // Check if user has completed fitness profile
+        try {
+          const profileResponse = await axios.get(
+            `${API_BASE_URL}${API_ENDPOINTS.PROFILE.FITNESS}?userId=${response.data.user.id}`
+          )
+          
+          if (profileResponse.data.profile) {
+            // User has profile, go to main app
+            Alert.alert('Success', 'Login successful!', [
+              { text: 'OK', onPress: () => router.replace('/(tabs)') }
+            ])
+          } else {
+            // New user, go to welcome page
+            Alert.alert('Welcome!', 'Let\'s set up your fitness profile', [
+              { text: 'OK', onPress: () => router.replace('/welcome') }
+            ])
+          }
+        } catch (profileError) {
+          // Profile doesn't exist or server error, treat as new user
+          console.log('Profile check failed:', profileError)
+          Alert.alert('Welcome!', 'Let\'s set up your fitness profile', [
+            { text: 'OK', onPress: () => router.replace('/welcome') }
+          ])
+        }
       }
     } catch (error: any) {
       Alert.alert('Error', error.response?.data?.error || 'Login failed')
diff --git a/apps/mobile/src/app/welcome.tsx b/apps/mobile/src/app/welcome.tsx
new file mode 100644
index 0000000..35c9e8c
--- /dev/null
+++ b/apps/mobile/src/app/welcome.tsx
@@ -0,0 +1,408 @@
+import React, { useState } from 'react'
+import { View, Text, TextInput, TouchableOpacity, StyleSheet, Alert, ScrollView } from 'react-native'
+import { useRouter } from 'expo-router'
+import axios from 'axios'
+import * as SecureStore from 'expo-secure-store'
+import { API_BASE_URL, API_ENDPOINTS } from '../config/api'
+
+interface FitnessProfile {
+  height: string
+  weight: string
+  age: string
+  gender: 'male' | 'female' | 'other'
+  activityLevel: 'sedentary' | 'light' | 'moderate' | 'active' | 'very_active'
+  fitnessGoals: string[]
+  exerciseHabits: string
+  dietHabits: string
+  medicalConditions: string
+}
+
+export default function WelcomeScreen() {
+  const [profile, setProfile] = useState<FitnessProfile>({
+    height: '',
+    weight: '',
+    age: '',
+    gender: 'male',
+    activityLevel: 'moderate',
+    fitnessGoals: [],
+    exerciseHabits: '',
+    dietHabits: '',
+    medicalConditions: '',
+  })
+  const [loading, setLoading] = useState(false)
+  const router = useRouter()
+
+  const fitnessGoalsOptions = [
+    'Weight Loss',
+    'Muscle Gain', 
+    'Improve Endurance',
+    'Better Flexibility',
+    'General Fitness',
+    'Strength Training',
+    'Cardio Health'
+  ]
+
+  const activityLevels = [
+    { value: 'sedentary', label: 'Sedentary (little or no exercise)' },
+    { value: 'light', label: 'Light (1-3 days/week)' },
+    { value: 'moderate', label: 'Moderate (3-5 days/week)' },
+    { value: 'active', label: 'Active (6-7 days/week)' },
+    { value: 'very_active', label: 'Very Active (twice per day)' }
+  ]
+
+  const toggleGoal = (goal: string) => {
+    setProfile(prev => ({
+      ...prev,
+      fitnessGoals: prev.fitnessGoals.includes(goal)
+        ? prev.fitnessGoals.filter(g => g !== goal)
+        : [...prev.fitnessGoals, goal]
+    }))
+  }
+
+  const handleSubmit = async () => {
+    if (!profile.height || !profile.weight || !profile.age) {
+      Alert.alert('Error', 'Please fill in all required fields')
+      return
+    }
+
+    setLoading(true)
+    try {
+      const user = await SecureStore.getItemAsync('user')
+      if (!user) {
+        throw new Error('No user found')
+      }
+
+      const userData = JSON.parse(user)
+      
+      const response = await axios.post(
+        `${API_BASE_URL}${API_ENDPOINTS.PROFILE.FITNESS}`,
+        {
+          userId: userData.id,
+          ...profile
+        }
+      )
+
+      if (response.status === 201) {
+        Alert.alert('Success', 'Profile completed successfully!', [
+          { text: 'OK', onPress: () => router.replace('/(tabs)') }
+        ])
+      }
+    } catch (error: any) {
+      console.log('Profile save error:', error)
+      Alert.alert('Error', error.response?.data?.error || 'Failed to save profile. Please try again.')
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  return (
+    <ScrollView style={styles.container}>
+      <View style={styles.content}>
+        <Text style={styles.title}>Welcome to FitAI!</Text>
+        <Text style={styles.subtitle}>Let's set up your fitness profile</Text>
+
+        <View style={styles.section}>
+          <Text style={styles.sectionTitle}>Basic Information</Text>
+          
+          <View style={styles.row}>
+            <View style={[styles.inputContainer, { flex: 1, marginRight: 8 }]}>
+              <Text style={styles.label}>Height (cm)</Text>
+              <TextInput
+                style={styles.input}
+                value={profile.height}
+                onChangeText={(text) => setProfile({ ...profile, height: text })}
+                keyboardType="numeric"
+                placeholder="170"
+              />
+            </View>
+            
+            <View style={[styles.inputContainer, { flex: 1, marginLeft: 8 }]}>
+              <Text style={styles.label}>Weight (kg)</Text>
+              <TextInput
+                style={styles.input}
+                value={profile.weight}
+                onChangeText={(text) => setProfile({ ...profile, weight: text })}
+                keyboardType="numeric"
+                placeholder="70"
+              />
+            </View>
+          </View>
+
+          <View style={styles.row}>
+            <View style={[styles.inputContainer, { flex: 1, marginRight: 8 }]}>
+              <Text style={styles.label}>Age</Text>
+              <TextInput
+                style={styles.input}
+                value={profile.age}
+                onChangeText={(text) => setProfile({ ...profile, age: text })}
+                keyboardType="numeric"
+                placeholder="25"
+              />
+            </View>
+            
+            <View style={[styles.inputContainer, { flex: 1, marginLeft: 8 }]}>
+              <Text style={styles.label}>Gender</Text>
+              <View style={styles.genderRow}>
+                {(['male', 'female', 'other'] as const).map((gender) => (
+                  <TouchableOpacity
+                    key={gender}
+                    style={[
+                      styles.genderButton,
+                      profile.gender === gender && styles.genderButtonSelected
+                    ]}
+                    onPress={() => setProfile({ ...profile, gender })}
+                  >
+                    <Text style={[
+                      styles.genderButtonText,
+                      profile.gender === gender && styles.genderButtonTextSelected
+                    ]}>
+                      {gender.charAt(0).toUpperCase() + gender.slice(1)}
+                    </Text>
+                  </TouchableOpacity>
+                ))}
+              </View>
+            </View>
+          </View>
+        </View>
+
+        <View style={styles.section}>
+          <Text style={styles.sectionTitle}>Activity Level</Text>
+          {activityLevels.map((level) => (
+            <TouchableOpacity
+              key={level.value}
+              style={[
+                styles.activityOption,
+                profile.activityLevel === level.value && styles.activityOptionSelected
+              ]}
+              onPress={() => setProfile({ ...profile, activityLevel: level.value as any })}
+            >
+              <Text style={[
+                styles.activityText,
+                profile.activityLevel === level.value && styles.activityTextSelected
+              ]}>
+                {level.label}
+              </Text>
+            </TouchableOpacity>
+          ))}
+        </View>
+
+        <View style={styles.section}>
+          <Text style={styles.sectionTitle}>Fitness Goals</Text>
+          <Text style={styles.sectionSubtitle}>Select all that apply</Text>
+          <View style={styles.goalsContainer}>
+            {fitnessGoalsOptions.map((goal) => (
+              <TouchableOpacity
+                key={goal}
+                style={[
+                  styles.goalButton,
+                  profile.fitnessGoals.includes(goal) && styles.goalButtonSelected
+                ]}
+                onPress={() => toggleGoal(goal)}
+              >
+                <Text style={[
+                  styles.goalButtonText,
+                  profile.fitnessGoals.includes(goal) && styles.goalButtonTextSelected
+                ]}>
+                  {goal}
+                </Text>
+              </TouchableOpacity>
+            ))}
+          </View>
+        </View>
+
+        <View style={styles.section}>
+          <Text style={styles.sectionTitle}>Exercise Habits</Text>
+          <TextInput
+            style={[styles.input, styles.textArea]}
+            value={profile.exerciseHabits}
+            onChangeText={(text) => setProfile({ ...profile, exerciseHabits: text })}
+            placeholder="Describe your current exercise routine..."
+            multiline
+            numberOfLines={3}
+          />
+        </View>
+
+        <View style={styles.section}>
+          <Text style={styles.sectionTitle}>Diet Habits</Text>
+          <TextInput
+            style={[styles.input, styles.textArea]}
+            value={profile.dietHabits}
+            onChangeText={(text) => setProfile({ ...profile, dietHabits: text })}
+            placeholder="Describe your current eating habits..."
+            multiline
+            numberOfLines={3}
+          />
+        </View>
+
+        <View style={styles.section}>
+          <Text style={styles.sectionTitle}>Medical Conditions (Optional)</Text>
+          <TextInput
+            style={[styles.input, styles.textArea]}
+            value={profile.medicalConditions}
+            onChangeText={(text) => setProfile({ ...profile, medicalConditions: text })}
+            placeholder="Any medical conditions we should know about..."
+            multiline
+            numberOfLines={3}
+          />
+        </View>
+
+        <TouchableOpacity
+          style={[styles.button, loading && styles.buttonDisabled]}
+          onPress={handleSubmit}
+          disabled={loading}
+        >
+          <Text style={styles.buttonText}>
+            {loading ? 'Saving...' : 'Complete Profile'}
+          </Text>
+        </TouchableOpacity>
+      </View>
+    </ScrollView>
+  )
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: '#f5f5f5',
+  },
+  content: {
+    padding: 20,
+  },
+  title: {
+    fontSize: 28,
+    fontWeight: 'bold',
+    marginBottom: 8,
+    color: '#333',
+    textAlign: 'center',
+  },
+  subtitle: {
+    fontSize: 16,
+    color: '#666',
+    marginBottom: 32,
+    textAlign: 'center',
+  },
+  section: {
+    marginBottom: 24,
+  },
+  sectionTitle: {
+    fontSize: 18,
+    fontWeight: '600',
+    marginBottom: 12,
+    color: '#333',
+  },
+  sectionSubtitle: {
+    fontSize: 14,
+    color: '#666',
+    marginBottom: 12,
+  },
+  row: {
+    flexDirection: 'row',
+    marginBottom: 16,
+  },
+  inputContainer: {
+    marginBottom: 16,
+  },
+  label: {
+    fontSize: 14,
+    fontWeight: '500',
+    marginBottom: 6,
+    color: '#333',
+  },
+  input: {
+    backgroundColor: 'white',
+    paddingHorizontal: 16,
+    paddingVertical: 12,
+    borderRadius: 8,
+    borderWidth: 1,
+    borderColor: '#ddd',
+    fontSize: 16,
+  },
+  textArea: {
+    height: 80,
+    textAlignVertical: 'top',
+  },
+  genderRow: {
+    flexDirection: 'row',
+  },
+  genderButton: {
+    flex: 1,
+    paddingVertical: 12,
+    paddingHorizontal: 8,
+    borderWidth: 1,
+    borderColor: '#ddd',
+    borderRadius: 8,
+    alignItems: 'center',
+    marginRight: 4,
+  },
+  genderButtonSelected: {
+    backgroundColor: '#3b82f6',
+    borderColor: '#3b82f6',
+  },
+  genderButtonText: {
+    fontSize: 12,
+    color: '#666',
+  },
+  genderButtonTextSelected: {
+    color: 'white',
+  },
+  activityOption: {
+    paddingVertical: 12,
+    paddingHorizontal: 16,
+    borderWidth: 1,
+    borderColor: '#ddd',
+    borderRadius: 8,
+    marginBottom: 8,
+    backgroundColor: 'white',
+  },
+  activityOptionSelected: {
+    backgroundColor: '#3b82f6',
+    borderColor: '#3b82f6',
+  },
+  activityText: {
+    fontSize: 14,
+    color: '#333',
+  },
+  activityTextSelected: {
+    color: 'white',
+  },
+  goalsContainer: {
+    flexDirection: 'row',
+    flexWrap: 'wrap',
+    marginHorizontal: -4,
+  },
+  goalButton: {
+    backgroundColor: 'white',
+    borderWidth: 1,
+    borderColor: '#ddd',
+    borderRadius: 20,
+    paddingHorizontal: 12,
+    paddingVertical: 8,
+    margin: 4,
+  },
+  goalButtonSelected: {
+    backgroundColor: '#3b82f6',
+    borderColor: '#3b82f6',
+  },
+  goalButtonText: {
+    fontSize: 12,
+    color: '#666',
+  },
+  goalButtonTextSelected: {
+    color: 'white',
+  },
+  button: {
+    backgroundColor: '#3b82f6',
+    paddingVertical: 16,
+    borderRadius: 8,
+    alignItems: 'center',
+    marginTop: 16,
+  },
+  buttonDisabled: {
+    backgroundColor: '#9ca3af',
+  },
+  buttonText: {
+    color: 'white',
+    fontSize: 16,
+    fontWeight: '600',
+  },
+})
\ No newline at end of file
diff --git a/apps/mobile/src/config/api.ts b/apps/mobile/src/config/api.ts
index b3b99a6..a9f6519 100644
--- a/apps/mobile/src/config/api.ts
+++ b/apps/mobile/src/config/api.ts
@@ -7,6 +7,9 @@ export const API_ENDPOINTS = {
     LOGIN: '/api/auth/login',
     REGISTER: '/api/auth/register',
   },
+  PROFILE: {
+    FITNESS: '/api/profile/fitness',
+  },
   CLIENTS: '/api/clients',
   USERS: '/api/users',
 }
\ No newline at end of file
diff --git a/strategy.md b/strategy.md
new file mode 100644
index 0000000..2c71a4b
--- /dev/null
+++ b/strategy.md
@@ -0,0 +1,3 @@
+## market penetration strategy
+
+- from gyms -> end users