You can keep track of videos you have watched by using your Video Tracker on the website. This keeps a record of the classes watched and the date on which they were watched. Please note: Downloaded videos are not tracked, as that feature in the app is designed for use without any connection.
To access your Video Tracker, click on your name, then My Account, and then click Video Tracker. On this page, you can use the filters to find any classes that you have watched.