diff --git a/app/controllers/lecture_controller.rb b/app/controllers/lecture_controller.rb
index 45ad7cf..84a0b45 100644
--- a/app/controllers/lecture_controller.rb
+++ b/app/controllers/lecture_controller.rb
@@ -11,4 +11,22 @@ class LectureController < ApplicationController
       redirect_to lecture.recording.recording_url, allow_other_host: true
     end
   end
+
+  def start_preparation
+    lecture = Lecture.find(params[:id])
+
+    Toggl::start_time_entry(
+      description: "#{lecture.title}: Prep",
+      project_id: lecture.course.toggl_project,
+    )
+  end
+
+  def start_review
+    lecture = Lecture.find(params[:id])
+
+    Toggl::start_time_entry(
+      description: "#{lecture.title}: Review",
+      project_id: lecture.course.toggl_project,
+    )
+  end
 end
diff --git a/app/lib/toggl.rb b/app/lib/toggl.rb
index 7f43956..6c0aabe 100644
--- a/app/lib/toggl.rb
+++ b/app/lib/toggl.rb
@@ -17,6 +17,7 @@ module Toggl
       body: {
         "created_with": "Attendance Tracker",
         "description": description,
+        "start": Time.now.utc.iso8601,
         "duration": -1,
         "project_id": project_id,
       }.to_json,
diff --git a/app/views/attendance_tracker/index.html.erb b/app/views/attendance_tracker/index.html.erb
index 024d4a3..fe3c1bf 100644
--- a/app/views/attendance_tracker/index.html.erb
+++ b/app/views/attendance_tracker/index.html.erb
@@ -48,6 +48,12 @@
                       </td>
 
                       <td class="whitespace-nowrap px-3 py-4 text-sm text-gray-500">
+                        <div class="flex justify-center">
+                          <%= button_to "Prepare",
+                                        lecture_start_preparation_path(id: lecture.id),
+                                        class: 'action-button'
+                          %>
+                        </div>
                       </td>
                     <% else %>
                       <td class="whitespace-nowrap px-3 py-4 text-sm text-gray-500 flex justify-center">
@@ -71,6 +77,13 @@
                                         class: 'action-button'
                           %>
                         <% else %>
+                          <div class="flex justify-center">
+                            <%= button_to "Review",
+                                          lecture_start_review_path(id: lecture.id),
+                                          class: 'action-button'
+                            %>
+                          </div>
+
                           <% if lecture.recording %>
                             <%= link_to "Open recording", lecture.recording&.recording_url %>
                           <% end %>
diff --git a/config/routes.rb b/config/routes.rb
index bd11a95..f40dfe5 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -11,4 +11,6 @@ Rails.application.routes.draw do
   root controller: :attendance_tracker, action: :index
 
   post '/lectures/:id/start', to: 'lecture#start', as: :lectures_start
+  post '/lectures/:id/start_preparation', to: 'lecture#start_preparation', as: :lecture_start_preparation
+  post '/lectures/:id/start_review', to: 'lecture#start_review', as: :lecture_start_review
 end