diff --git a/app/repositories/workout_repository.py b/app/repositories/workout_repository.py
index e69de29..feb226e 100644
--- a/app/repositories/workout_repository.py
+++ b/app/repositories/workout_repository.py
@@ -0,0 +1,31 @@
+from app.models.workout import Workout
+
+class WorkoutRepository:
+    def __init__(self):
+        self.workouts = []
+
+    def add_workout(self, workout: Workout):
+        self.workouts.append(workout)
+
+    def get_all_workouts(self):
+        return self.workouts
+
+    def get_workout_by_id(self, workout_id: int):
+        for workout in self.workouts:
+            if workout.id == workout_id:
+                return workout
+        return None
+
+    def update_workout(self, workout_id: int, updated_workout: Workout):
+        for i, workout in enumerate(self.workouts):
+            if workout.id == workout_id:
+                self.workouts[i] = updated_workout
+                return True
+        return False
+
+    def delete_workout(self, workout_id: int):
+        for i, workout in enumerate(self.workouts):
+            if workout.id == workout_id:
+                del self.workouts[i]
+                return True
+        return False
\ No newline at end of file