diff --git a/api/activity.py b/api/activity.py
index 036fbc1..8e2afe6 100644
--- a/api/activity.py
+++ b/api/activity.py
@@ -27,7 +27,10 @@ def create_activity():
             elevation_gain=data['elevation_gain'],
             elevation_loss=data['elevation_loss'],
             max_elevation=data['max_elevation'],
-            min_elevation=data['min_elevation']
+            min_elevation=data['min_elevation'],
+            steps=data.get('steps'),
+            floors=data.get('floors'),
+            zone_minutes=data.get('zone_minutes')
         )
 
         # Optional time series
diff --git a/api/body_insight.py b/api/body_insight.py
index ca6cdee..8f271ec 100644
--- a/api/body_insight.py
+++ b/api/body_insight.py
@@ -27,6 +27,11 @@ def add_body_insight():
         if not latest_activity:
             return jsonify({"error": "No activities found for user"}), 404
         activity_id = latest_activity.id
+    
+    # Check for existing body_insight for activity
+    existing = BodyInsight.query.filter_by(activity_id=activity_id).first()
+    if existing:
+        return jsonify({"error": "BodyInsight already exists for this activity"}), 409
 
     try:
         insight = BodyInsight(
diff --git a/api/sessions.py b/api/sessions.py
index a2ccc49..b93e382 100644
--- a/api/sessions.py
+++ b/api/sessions.py
@@ -1,10 +1,13 @@
 from flask import Blueprint, jsonify
 from models.activity import Activity
+from models.body_insight import BodyInsight
+from models.sleep_data import SleepData
 from models import db
 from datetime import datetime
 
 sessions_bp = Blueprint('sessions_api', __name__)
 
+# Get all sessions summary for table.
 @sessions_bp.route('', methods=['GET'])
 def get_sessions():
     # replace with authenticated user ID from session/token
@@ -23,3 +26,30 @@ def get_sessions():
         })
     
     return jsonify(sessions), 200
+
+
+
+# Get activity, body insight and sleep data details for a single session
+@sessions_bp.route('/<int:session_id>/details', methods=['GET'])
+def get_session_details(session_id):
+    # Fetch the activity
+    activity = Activity.query.get(session_id)
+    if not activity:
+        return jsonify({"error": "Session not found"}), 404
+
+    # Fetch the linked BodyInsight, if it exists
+    body_insight = BodyInsight.query.filter_by(activity_id=activity.id).first()
+
+    # Fetch sleep data for the same date as the activity
+    sleep_entry = SleepData.query.filter_by(
+        user_id=activity.user_id,
+        date=activity.begin_time.date()
+    ).first()
+
+    response = {
+        "activity": activity.as_dict(),
+        "body_insight": body_insight.as_dict() if body_insight else None,
+        "sleep_data": sleep_entry.as_dict() if sleep_entry else None
+    }
+
+    return jsonify(response), 200
\ No newline at end of file
diff --git a/api/sleep_data.py b/api/sleep_data.py
new file mode 100644
index 0000000..3203974
--- /dev/null
+++ b/api/sleep_data.py
@@ -0,0 +1,56 @@
+# /api/sleep_data.py
+from flask import Blueprint, request, jsonify
+from models.sleep_data import SleepData
+from models import db
+from datetime import datetime
+
+sleep_data_bp = Blueprint('sleep_data', __name__, url_prefix='/api/sleep_data')
+
+# For now, mimic authenticated user
+def get_current_user_id():
+    return 1  # Replace with token/session in future
+
+
+# POST new sleep record
+@sleep_data_bp.route('', methods=['POST'])
+def add_sleep_data():
+    data = request.get_json()
+    user_id = get_current_user_id()
+
+    if not data.get('date') or not data.get('duration_minutes'):
+        return jsonify({"error": "Missing required fields: date, duration_minutes"}), 400
+
+    try:
+        sleep_date = datetime.strptime(data['date'], "%Y-%m-%d").date()
+    except ValueError:
+        return jsonify({"error": "Invalid date format. Use YYYY-MM-DD"}), 400
+
+    sleep_entry = SleepData(
+        user_id=user_id,
+        date=sleep_date,
+        duration_minutes=data['duration_minutes'],
+        sleep_score=data.get('sleep_score')
+    )
+
+    db.session.add(sleep_entry)
+    db.session.commit()
+
+    return jsonify(sleep_entry.as_dict()), 201
+
+
+# GET all sleep records for the current user
+@sleep_data_bp.route('', methods=['GET'])
+def get_all_sleep():
+    user_id = get_current_user_id()
+    entries = SleepData.query.filter_by(user_id=user_id).order_by(SleepData.date.desc()).all()
+    return jsonify([e.as_dict() for e in entries]), 200
+
+
+# GET sleep record by ID (scoped to current user)
+@sleep_data_bp.route('/<int:id>', methods=['GET'])
+def get_sleep_by_id(id):
+    user_id = get_current_user_id()
+    entry = SleepData.query.filter_by(id=id, user_id=user_id).first()
+    if not entry:
+        return jsonify({"error": "Sleep record not found for this user"}), 404
+    return jsonify(entry.as_dict()), 200
diff --git a/app.py b/app.py
index fa5415b..cceed38 100644
--- a/app.py
+++ b/app.py
@@ -4,6 +4,11 @@
 from api.goals import goals_bp
 from api.profile import api as profile_api
 from api.dashboard import dashboard_bp
+from api.body_insight import body_insight_bp
+from api.activity import activity_bp
+from api.sessions import sessions_bp
+from api.sleep_data import sleep_data_bp
+from api.sync import sync_bp
 from models import db
 from dotenv import load_dotenv
 from services.firebase_admin import init_firebase_admin
@@ -73,6 +78,11 @@
 app.register_blueprint(goals_bp, url_prefix='/api/goals')
 app.register_blueprint(dashboard_bp, url_prefix='/api/dashboard')
 app.register_blueprint(profile_api, url_prefix='/api/profile')
+app.register_blueprint(sync_bp, url_prefix='/api/synced')
+app.register_blueprint(body_insight_bp, url_prefix='/api/body_insight')
+app.register_blueprint(activity_bp, url_prefix='/api/activity')
+app.register_blueprint(sessions_bp, url_prefix='/api/sessions')
+app.register_blueprint(sleep_data_bp, url_prefix='/api/sleep_data')
 
 # Main index route (login + welcome)
 @app.route('/', methods=['GET', 'POST'])
diff --git a/models/__init__.py b/models/__init__.py
index b25ac4f..9cc31e6 100644
--- a/models/__init__.py
+++ b/models/__init__.py
@@ -7,3 +7,4 @@
 from .activity_summary import ActivitySummary
 from .metadata import ActivityMetadata
 from .body_insight import BodyInsight
+from .sleep_data import SleepData
\ No newline at end of file
diff --git a/models/activity.py b/models/activity.py
index 0f64fbd..4347f5f 100644
--- a/models/activity.py
+++ b/models/activity.py
@@ -25,6 +25,10 @@ class Activity(db.Model):
     elevation_loss = db.Column(db.Float, nullable=False)
     max_elevation = db.Column(db.Float, nullable=False)
     min_elevation = db.Column(db.Float, nullable=False)
+    steps = db.Column(db.Integer,nullable=True)
+    floors = db.Column(db.Integer,nullable=True)
+    zone_minutes = db.Column(db.Integer, nullable=True)
+
     
 
 
@@ -51,6 +55,9 @@ def as_dict(self):
             "elevation_loss": self.elevation_loss,
             "max_elevation": self.max_elevation,
             "min_elevation": self.min_elevation,
+            "steps" : self.steps,
+            "floors" : self.floors,
+            "zone_minutes": self.zone_minutes,
             "time_series": [ts.as_dict() for ts in self.time_series]
         }
 
diff --git a/models/body_insight.py b/models/body_insight.py
index 643f6ab..bfae0c0 100644
--- a/models/body_insight.py
+++ b/models/body_insight.py
@@ -4,8 +4,13 @@ class BodyInsight(db.Model):
     __tablename__ = 'body_insight'
 
     id = db.Column(db.Integer, primary_key=True)
-    activity_id = db.Column(db.Integer, db.ForeignKey('activity.id'), nullable=False)
+    activity_id = db.Column(db.Integer, db.ForeignKey('activity.id'), nullable=False, unique=True)
 
+    activity = db.relationship(
+        'Activity',
+        backref=db.backref('body_insight', uselist=False)  # Makes SQLAlchemy treat it as one-to-one
+    )
+    
     # Performance Metrics
     vo2_max = db.Column(db.Float, nullable=True)
     lactate_threshold = db.Column(db.Float, nullable=True)
diff --git a/models/sleep_data.py b/models/sleep_data.py
new file mode 100644
index 0000000..bf1ad53
--- /dev/null
+++ b/models/sleep_data.py
@@ -0,0 +1,22 @@
+from models import db
+from datetime import date
+
+class SleepData(db.Model):
+    __tablename__ = 'sleep_data'
+
+    id = db.Column(db.Integer, primary_key=True)
+    user_id = db.Column(db.Integer, db.ForeignKey('user_profile.id'), nullable=False)
+    date = db.Column(db.Date, nullable=False)  # The night the sleep occurred
+    duration_minutes = db.Column(db.Integer, nullable=False)   # Total sleep in minutes
+    sleep_score = db.Column(db.Float, nullable=True)           # Optional sleep quality score (0-100)
+
+    def as_dict(self):
+        return {
+            "id": self.id,
+            "user_id": self.user_id,
+            "date": self.date.isoformat(),
+            "duration_minutes": self.duration_minutes,
+            "hours": self.duration_minutes // 60,
+            "minutes": self.duration_minutes % 60,
+            "sleep_score": self.sleep_score
+        }