diff --git a/app/models/exercise_collection.rb b/app/models/exercise_collection.rb
index 10946962..f9f09269 100644
--- a/app/models/exercise_collection.rb
+++ b/app/models/exercise_collection.rb
@@ -1,6 +1,7 @@
 class ExerciseCollection < ActiveRecord::Base
 
   has_and_belongs_to_many :exercises
+  belongs_to :user, polymorphic: true
 
   def to_s
     "#{I18n.t('activerecord.models.exercise_collection.one')}: #{name} (#{id})"
diff --git a/db/migrate/20171210172208_add_user_to_exercise_collection.rb b/db/migrate/20171210172208_add_user_to_exercise_collection.rb
new file mode 100644
index 00000000..6dee1adf
--- /dev/null
+++ b/db/migrate/20171210172208_add_user_to_exercise_collection.rb
@@ -0,0 +1,5 @@
+class AddUserToExerciseCollection < ActiveRecord::Migration
+  def change
+    add_reference :exercise_collections, :user,  polymorphic: true, index: true
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index e3f55f7c..474aa6f1 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20171122124222) do
+ActiveRecord::Schema.define(version: 20171210172208) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -105,8 +105,12 @@ ActiveRecord::Schema.define(version: 20171122124222) do
     t.datetime "created_at"
     t.datetime "updated_at"
     t.boolean  "use_anomaly_detection", default: false
+    t.integer  "user_id"
+    t.string   "user_type"
   end
 
+  add_index "exercise_collections", ["user_type", "user_id"], name: "index_exercise_collections_on_user_type_and_user_id", using: :btree
+
   create_table "exercise_collections_exercises", id: false, force: :cascade do |t|
     t.integer "exercise_collection_id"
     t.integer "exercise_id"