diff --git a/fittrackee/tests/fixtures/fixtures_workouts.py b/fittrackee/tests/fixtures/fixtures_workouts.py
index 0f19b5f1..4db4609a 100644
--- a/fittrackee/tests/fixtures/fixtures_workouts.py
+++ b/fittrackee/tests/fixtures/fixtures_workouts.py
@@ -10,7 +10,7 @@ from werkzeug.datastructures import FileStorage
 
 from fittrackee import db
 from fittrackee.workouts.models import Sport, Workout, WorkoutSegment
-from fittrackee.workouts.utils import StaticMap
+from fittrackee.workouts.utils.maps import StaticMap
 
 byte_io = BytesIO()
 Image.new('RGB', (256, 256)).save(byte_io, 'PNG')
diff --git a/fittrackee/tests/workouts/test_utils/__init__.py b/fittrackee/tests/workouts/test_utils/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/fittrackee/tests/workouts/test_gpx_utils.py b/fittrackee/tests/workouts/test_utils/test_gpx.py
similarity index 93%
rename from fittrackee/tests/workouts/test_gpx_utils.py
rename to fittrackee/tests/workouts/test_utils/test_gpx.py
index df5da68c..06d655a0 100644
--- a/fittrackee/tests/workouts/test_gpx_utils.py
+++ b/fittrackee/tests/workouts/test_utils/test_gpx.py
@@ -7,7 +7,7 @@ from werkzeug.datastructures import FileStorage
 
 from fittrackee.users.models import User, UserSportPreference
 from fittrackee.workouts.models import Sport
-from fittrackee.workouts.utils import process_files
+from fittrackee.workouts.utils.workouts import process_files
 
 folders = {
     'extract_dir': '/tmp/fitTrackee/uploads',
@@ -38,7 +38,7 @@ class TestStoppedSpeedThreshold:
         expected_threshold: float,
     ) -> None:
         with patch(
-            'fittrackee.workouts.utils.get_new_file_path',
+            'fittrackee.workouts.utils.workouts.get_new_file_path',
             return_value='/tmp/fitTrackee/uploads/test.png',
         ), patch(
             'gpxpy.gpx.GPXTrackSegment.get_moving_data',
@@ -68,7 +68,7 @@ class TestStoppedSpeedThreshold:
         expected_threshold = 0.7
         user_sport_1_preference.stopped_speed_threshold = expected_threshold
         with patch(
-            'fittrackee.workouts.utils.get_new_file_path',
+            'fittrackee.workouts.utils.workouts.get_new_file_path',
             return_value='/tmp/fitTrackee/uploads/test.png',
         ), patch(
             'gpxpy.gpx.GPXTrackSegment.get_moving_data',
diff --git a/fittrackee/tests/workouts/test_workouts_utils.py b/fittrackee/tests/workouts/test_utils/test_workouts.py
similarity index 92%
rename from fittrackee/tests/workouts/test_workouts_utils.py
rename to fittrackee/tests/workouts/test_utils/test_workouts.py
index ba824198..0e325878 100644
--- a/fittrackee/tests/workouts/test_workouts_utils.py
+++ b/fittrackee/tests/workouts/test_utils/test_workouts.py
@@ -3,7 +3,7 @@ from typing import List
 
 import pytest
 
-from fittrackee.workouts.utils import get_average_speed
+from fittrackee.workouts.utils.workouts import get_average_speed
 
 
 class TestWorkoutAverageSpeed:
diff --git a/fittrackee/tests/workouts/test_workouts_api_1_post.py b/fittrackee/tests/workouts/test_workouts_api_1_post.py
index a8ad9386..740581f8 100644
--- a/fittrackee/tests/workouts/test_workouts_api_1_post.py
+++ b/fittrackee/tests/workouts/test_workouts_api_1_post.py
@@ -11,7 +11,7 @@ from flask import Flask
 
 from fittrackee.users.models import User
 from fittrackee.workouts.models import Sport, Workout
-from fittrackee.workouts.utils_id import decode_short_id
+from fittrackee.workouts.utils.short_id import decode_short_id
 
 from ..api_test_case import ApiTestCaseMixin, CallArgsMixin
 
diff --git a/fittrackee/tests/workouts/test_workouts_api_3_delete.py b/fittrackee/tests/workouts/test_workouts_api_3_delete.py
index 25369e30..4b1aba91 100644
--- a/fittrackee/tests/workouts/test_workouts_api_3_delete.py
+++ b/fittrackee/tests/workouts/test_workouts_api_3_delete.py
@@ -3,9 +3,9 @@ import os
 
 from flask import Flask
 
+from fittrackee.files import get_absolute_file_path
 from fittrackee.users.models import User
 from fittrackee.workouts.models import Sport, Workout
-from fittrackee.workouts.utils import get_absolute_file_path
 
 from ..api_test_case import ApiTestCaseMixin
 from .utils import get_random_short_id, post_an_workout
diff --git a/fittrackee/tests/workouts/test_workouts_model.py b/fittrackee/tests/workouts/test_workouts_model.py
index 2f4c5859..6c7167af 100644
--- a/fittrackee/tests/workouts/test_workouts_model.py
+++ b/fittrackee/tests/workouts/test_workouts_model.py
@@ -5,7 +5,7 @@ from flask import Flask
 from fittrackee import db
 from fittrackee.users.models import User
 from fittrackee.workouts.models import Sport, Workout
-from fittrackee.workouts.utils_id import decode_short_id
+from fittrackee.workouts.utils.short_id import decode_short_id
 
 
 class TestWorkoutModel:
diff --git a/fittrackee/tests/workouts/utils.py b/fittrackee/tests/workouts/utils.py
index 8b8d101d..7aaea2f6 100644
--- a/fittrackee/tests/workouts/utils.py
+++ b/fittrackee/tests/workouts/utils.py
@@ -5,7 +5,7 @@ from uuid import uuid4
 
 from flask import Flask
 
-from fittrackee.workouts.utils_id import encode_uuid
+from fittrackee.workouts.utils.short_id import encode_uuid
 
 
 def get_random_short_id() -> str:
diff --git a/fittrackee/users/utils.py b/fittrackee/users/utils.py
deleted file mode 100644
index f6374198..00000000
--- a/fittrackee/users/utils.py
+++ /dev/null
@@ -1,109 +0,0 @@
-import re
-from typing import Optional, Tuple
-
-from flask import Request
-
-from fittrackee import db
-from fittrackee.responses import (
-    ForbiddenErrorResponse,
-    HttpResponse,
-    UnauthorizedErrorResponse,
-)
-
-from .exceptions import UserNotFoundException
-from .models import User
-
-
-def is_valid_email(email: str) -> bool:
-    """
-    Return if email format is valid
-    """
-    mail_pattern = r"(^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$)"
-    return re.match(mail_pattern, email) is not None
-
-
-def check_passwords(password: str, password_conf: str) -> str:
-    """
-    Verify if password and password confirmation are the same and have
-    more than 8 characters
-
-    If not, it returns not empty string
-    """
-    ret = ''
-    if password_conf != password:
-        ret = 'password: password and password confirmation do not match\n'
-    if len(password) < 8:
-        ret += 'password: 8 characters required\n'
-    return ret
-
-
-def check_username(username: str) -> str:
-    """
-    Return if username is valid
-    """
-    ret = ''
-    if not 2 < len(username) < 13:
-        ret += 'username: 3 to 12 characters required\n'
-    if not re.match(r'^[a-zA-Z0-9_]+$', username):
-        ret += (
-            'username: only alphanumeric characters and the '
-            'underscore character "_" allowed\n'
-        )
-    return ret
-
-
-def register_controls(
-    username: str, email: str, password: str, password_conf: str
-) -> str:
-    """
-    Verify if username, email and passwords are valid
-
-    If not, it returns not empty string
-    """
-    ret = check_username(username)
-    if not is_valid_email(email):
-        ret += 'email: valid email must be provided\n'
-    ret += check_passwords(password, password_conf)
-    return ret
-
-
-def verify_user(
-    current_request: Request, verify_admin: bool
-) -> Tuple[Optional[HttpResponse], Optional[User]]:
-    """
-    Return authenticated user, if the provided token is valid and user has
-    admin rights if 'verify_admin' is True
-    """
-    default_message = 'provide a valid auth token'
-    auth_header = current_request.headers.get('Authorization')
-    if not auth_header:
-        return UnauthorizedErrorResponse(default_message), None
-    auth_token = auth_header.split(' ')[1]
-    resp = User.decode_auth_token(auth_token)
-    if isinstance(resp, str):
-        return UnauthorizedErrorResponse(resp), None
-    user = User.query.filter_by(id=resp).first()
-    if not user:
-        return UnauthorizedErrorResponse(default_message), None
-    if verify_admin and not user.admin:
-        return ForbiddenErrorResponse(), None
-    return None, user
-
-
-def can_view_workout(
-    auth_user_id: int, workout_user_id: int
-) -> Optional[HttpResponse]:
-    """
-    Return error response if user has no right to view workout
-    """
-    if auth_user_id != workout_user_id:
-        return ForbiddenErrorResponse()
-    return None
-
-
-def set_admin_rights(username: str) -> None:
-    user = User.query.filter_by(username=username).first()
-    if not user:
-        raise UserNotFoundException()
-    user.admin = True
-    db.session.commit()
diff --git a/fittrackee/workouts/models.py b/fittrackee/workouts/models.py
index 083c88a4..ac5e2273 100644
--- a/fittrackee/workouts/models.py
+++ b/fittrackee/workouts/models.py
@@ -15,8 +15,8 @@ from sqlalchemy.types import JSON, Enum
 from fittrackee import db
 from fittrackee.files import get_absolute_file_path
 
-from .utils_format import convert_in_duration, convert_value_to_integer
-from .utils_id import encode_uuid
+from .utils.convert import convert_in_duration, convert_value_to_integer
+from .utils.short_id import encode_uuid
 
 BaseModel: DeclarativeMeta = db.Model
 record_types = [
diff --git a/fittrackee/workouts/stats.py b/fittrackee/workouts/stats.py
index bccfafe9..9c3da148 100644
--- a/fittrackee/workouts/stats.py
+++ b/fittrackee/workouts/stats.py
@@ -16,12 +16,9 @@ from fittrackee.users.decorators import authenticate, authenticate_as_admin
 from fittrackee.users.models import User
 
 from .models import Sport, Workout
-from .utils import (
-    get_average_speed,
-    get_datetime_from_request_args,
-    get_upload_dir_size,
-)
-from .utils_format import convert_timedelta_to_integer
+from .utils.convert import convert_timedelta_to_integer
+from .utils.uploads import get_upload_dir_size
+from .utils.workouts import get_average_speed, get_datetime_from_request_args
 
 stats_blueprint = Blueprint('stats', __name__)
 
diff --git a/fittrackee/workouts/utils/__init__.py b/fittrackee/workouts/utils/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/fittrackee/workouts/utils_format.py b/fittrackee/workouts/utils/convert.py
similarity index 100%
rename from fittrackee/workouts/utils_format.py
rename to fittrackee/workouts/utils/convert.py
diff --git a/fittrackee/workouts/utils_gpx.py b/fittrackee/workouts/utils/gpx.py
similarity index 98%
rename from fittrackee/workouts/utils_gpx.py
rename to fittrackee/workouts/utils/gpx.py
index 02777b58..f549014f 100644
--- a/fittrackee/workouts/utils_gpx.py
+++ b/fittrackee/workouts/utils/gpx.py
@@ -3,8 +3,8 @@ from typing import Any, Dict, List, Optional, Tuple
 
 import gpxpy.gpx
 
-from .exceptions import WorkoutGPXException
-from .utils_weather import get_weather
+from ..exceptions import WorkoutGPXException
+from .weather import get_weather
 
 
 def open_gpx_file(gpx_file: str) -> Optional[gpxpy.gpx.GPX]:
diff --git a/fittrackee/workouts/utils/maps.py b/fittrackee/workouts/utils/maps.py
new file mode 100644
index 00000000..fda84ac6
--- /dev/null
+++ b/fittrackee/workouts/utils/maps.py
@@ -0,0 +1,35 @@
+import hashlib
+from typing import List
+
+from flask import current_app
+from staticmap import Line, StaticMap
+
+from fittrackee.files import get_absolute_file_path
+
+
+def generate_map(map_filepath: str, map_data: List) -> None:
+    """
+    Generate and save map image from map data
+    """
+    m = StaticMap(400, 225, 10)
+    if not current_app.config['TILE_SERVER']['DEFAULT_STATICMAP']:
+        m.url_template = current_app.config['TILE_SERVER']['URL'].replace(
+            '{s}.', ''
+        )
+    line = Line(map_data, '#3388FF', 4)
+    m.add_line(line)
+    image = m.render()
+    image.save(map_filepath)
+
+
+def get_map_hash(map_filepath: str) -> str:
+    """
+    Generate a md5 hash used as id instead of workout id, to retrieve map
+    image (maps are sensitive data)
+    """
+    md5 = hashlib.md5()
+    absolute_map_filepath = get_absolute_file_path(map_filepath)
+    with open(absolute_map_filepath, 'rb') as f:
+        for chunk in iter(lambda: f.read(128 * md5.block_size), b''):
+            md5.update(chunk)
+    return md5.hexdigest()
diff --git a/fittrackee/workouts/utils_id.py b/fittrackee/workouts/utils/short_id.py
similarity index 87%
rename from fittrackee/workouts/utils_id.py
rename to fittrackee/workouts/utils/short_id.py
index bf81bab4..86ec5126 100644
--- a/fittrackee/workouts/utils_id.py
+++ b/fittrackee/workouts/utils/short_id.py
@@ -5,7 +5,7 @@ import shortuuid
 
 def encode_uuid(uuid_value: UUID) -> str:
     """
-    Return short id string from an UUID
+    Return short id string from a UUID
     """
     return shortuuid.encode(uuid_value)
 
diff --git a/fittrackee/workouts/utils/uploads.py b/fittrackee/workouts/utils/uploads.py
new file mode 100644
index 00000000..60e7ebe7
--- /dev/null
+++ b/fittrackee/workouts/utils/uploads.py
@@ -0,0 +1,16 @@
+import os
+
+from fittrackee.files import get_absolute_file_path
+
+
+def get_upload_dir_size() -> int:
+    """
+    Return upload directory size
+    """
+    upload_path = get_absolute_file_path('')
+    total_size = 0
+    for dir_path, _, filenames in os.walk(upload_path):
+        for f in filenames:
+            fp = os.path.join(dir_path, f)
+            total_size += os.path.getsize(fp)
+    return total_size
diff --git a/fittrackee/workouts/utils_weather.py b/fittrackee/workouts/utils/weather.py
similarity index 100%
rename from fittrackee/workouts/utils_weather.py
rename to fittrackee/workouts/utils/weather.py
diff --git a/fittrackee/workouts/utils.py b/fittrackee/workouts/utils/workouts.py
similarity index 89%
rename from fittrackee/workouts/utils.py
rename to fittrackee/workouts/utils/workouts.py
index 03243263..e9159423 100644
--- a/fittrackee/workouts/utils.py
+++ b/fittrackee/workouts/utils/workouts.py
@@ -1,4 +1,3 @@
-import hashlib
 import os
 import tempfile
 import zipfile
@@ -10,7 +9,6 @@ import gpxpy.gpx
 import pytz
 from flask import current_app
 from sqlalchemy import exc
-from staticmap import Line, StaticMap
 from werkzeug.datastructures import FileStorage
 from werkzeug.utils import secure_filename
 
@@ -18,9 +16,10 @@ from fittrackee import db
 from fittrackee.files import get_absolute_file_path
 from fittrackee.users.models import User, UserSportPreference
 
-from .exceptions import WorkoutException
-from .models import Sport, Workout, WorkoutSegment
-from .utils_gpx import get_gpx_info
+from ..exceptions import WorkoutException
+from ..models import Sport, Workout, WorkoutSegment
+from .gpx import get_gpx_info
+from .maps import generate_map, get_map_hash
 
 
 def get_datetime_with_tz(
@@ -258,39 +257,11 @@ def get_new_file_path(
     return file_path
 
 
-def generate_map(map_filepath: str, map_data: List) -> None:
-    """
-    Generate and save map image from map data
-    """
-    m = StaticMap(400, 225, 10)
-    if not current_app.config['TILE_SERVER']['DEFAULT_STATICMAP']:
-        m.url_template = current_app.config['TILE_SERVER']['URL'].replace(
-            '{s}.', ''
-        )
-    line = Line(map_data, '#3388FF', 4)
-    m.add_line(line)
-    image = m.render()
-    image.save(map_filepath)
-
-
-def get_map_hash(map_filepath: str) -> str:
-    """
-    Generate a md5 hash used as id instead of workout id, to retrieve map
-    image (maps are sensitive data)
-    """
-    md5 = hashlib.md5()
-    absolute_map_filepath = get_absolute_file_path(map_filepath)
-    with open(absolute_map_filepath, 'rb') as f:
-        for chunk in iter(lambda: f.read(128 * md5.block_size), b''):
-            md5.update(chunk)
-    return md5.hexdigest()
-
-
 def process_one_gpx_file(
     params: Dict, filename: str, stopped_speed_threshold: float
 ) -> Workout:
     """
-    Get all data from a gpx file to create an workout with map image
+    Get all data from a gpx file to create a workout with map image
     """
     try:
         gpx_data, map_data, weather_data = get_gpx_info(
@@ -433,19 +404,6 @@ def process_files(
         )
 
 
-def get_upload_dir_size() -> int:
-    """
-    Return upload directory size
-    """
-    upload_path = get_absolute_file_path('')
-    total_size = 0
-    for dir_path, _, filenames in os.walk(upload_path):
-        for f in filenames:
-            fp = os.path.join(dir_path, f)
-            total_size += os.path.getsize(fp)
-    return total_size
-
-
 def get_average_speed(
     nb_workouts: int, total_average_speed: float, workout_average_speed: float
 ) -> float:
diff --git a/fittrackee/workouts/workouts.py b/fittrackee/workouts/workouts.py
index 7b9beff4..41f8d8b1 100644
--- a/fittrackee/workouts/workouts.py
+++ b/fittrackee/workouts/workouts.py
@@ -33,7 +33,14 @@ from fittrackee.users.models import User
 from fittrackee.users.utils import can_view_workout
 
 from .models import Workout
-from .utils import (
+from .utils.convert import convert_in_duration
+from .utils.gpx import (
+    WorkoutGPXException,
+    extract_segment_from_gpx_file,
+    get_chart_data,
+)
+from .utils.short_id import decode_short_id
+from .utils.workouts import (
     WorkoutException,
     create_workout,
     edit_workout,
@@ -41,13 +48,6 @@ from .utils import (
     get_datetime_from_request_args,
     process_files,
 )
-from .utils_format import convert_in_duration
-from .utils_gpx import (
-    WorkoutGPXException,
-    extract_segment_from_gpx_file,
-    get_chart_data,
-)
-from .utils_id import decode_short_id
 
 workouts_blueprint = Blueprint('workouts', __name__)