diff --git a/backend/tests/TestExerciseNumber.py b/backend/tests/TestExerciseNumber.py
index f173cc6..7d2d8d2 100644
--- a/backend/tests/TestExerciseNumber.py
+++ b/backend/tests/TestExerciseNumber.py
@@ -13,7 +13,7 @@ def setUp(self):
         self.user = get_user_model().objects.create_user(username="testuser", password="password")
         self.client.force_authenticate(self.user)
  
-    def test_create_workout_valid(self):  #
+    def test_exercise_number_negative_number(self): 
         response = self.client.post("/api/workouts/", {
             "name": "Morning Run",
             "date": now().isoformat(),
@@ -27,7 +27,7 @@ def test_create_workout_valid(self):  #
         assert response.status_code == 201
         assert Workout.objects.count() == 1
  
-    def test_create_workout_invalid_date(self):  #
+    def test_exercise_number_non_number(self):  #
         response = self.client.post("/api/workouts/", {
             "name": "Invalid Run",
             "date": "invalid_date",
@@ -38,4 +38,87 @@ def test_create_workout_invalid_date(self):  #
         }, format="json")
        
         assert response.status_code == 400  # Should return validation error
- 
\ No newline at end of file
+
+    def test_exercise_number_min_minus(self):  #
+        response = self.client.post("/api/workouts/", {
+            "name": "Invalid Run",
+            "date": "invalid_date",
+            "notes": "Wrong format",
+            "visibility": "PU",  # Adding required field
+            "owner": self.user.id,  # Adding required field
+            "exercise_instances": []  # Adding required field
+        }, format="json")
+       
+        assert response.status_code == 400  # Should return validation error
+
+    def test_exercise_number_min(self):  #
+        response = self.client.post("/api/workouts/", {
+            "name": "Invalid Run",
+            "date": "invalid_date",
+            "notes": "Wrong format",
+            "visibility": "PU",  # Adding required field
+            "owner": self.user.id,  # Adding required field
+            "exercise_instances": []  # Adding required field
+        }, format="json")
+       
+        assert response.status_code == 400  # Should return validation error
+    
+    def test_exercise_number_min_plus(self):  #
+        response = self.client.post("/api/workouts/", {
+            "name": "Invalid Run",
+            "date": "invalid_date",
+            "notes": "Wrong format",
+            "visibility": "PU",  # Adding required field
+            "owner": self.user.id,  # Adding required field
+            "exercise_instances": []  # Adding required field
+        }, format="json")
+       
+        assert response.status_code == 400  # Should return validation error
+ 
+    def test_exercise_number_nom(self):  #
+        response = self.client.post("/api/workouts/", {
+            "name": "Invalid Run",
+            "date": "invalid_date",
+            "notes": "Wrong format",
+            "visibility": "PU",  # Adding required field
+            "owner": self.user.id,  # Adding required field
+            "exercise_instances": []  # Adding required field
+        }, format="json")
+       
+        assert response.status_code == 400  # Should return validation error
+
+    def test_exercise_number_max_minus(self):  #
+        response = self.client.post("/api/workouts/", {
+            "name": "Invalid Run",
+            "date": "invalid_date",
+            "notes": "Wrong format",
+            "visibility": "PU",  # Adding required field
+            "owner": self.user.id,  # Adding required field
+            "exercise_instances": []  # Adding required field
+        }, format="json")
+       
+        assert response.status_code == 400  # Should return validation error
+
+    def test_exercise_number_max(self):  #
+        response = self.client.post("/api/workouts/", {
+            "name": "Invalid Run",
+            "date": "invalid_date",
+            "notes": "Wrong format",
+            "visibility": "PU",  # Adding required field
+            "owner": self.user.id,  # Adding required field
+            "exercise_instances": []  # Adding required field
+        }, format="json")
+       
+        assert response.status_code == 400  # Should return validation error
+
+    def test_exercise_number_max_plus(self):  #
+        response = self.client.post("/api/workouts/", {
+            "name": "Invalid Run",
+            "date": "invalid_date",
+            "notes": "Wrong format",
+            "visibility": "PU",  # Adding required field
+            "owner": self.user.id,  # Adding required field
+            "exercise_instances": []  # Adding required field
+        }, format="json")
+       
+        assert response.status_code == 400  # Should return validation error
\ No newline at end of file