Xert is designed as a dual device platform running a mobile phone app (or Connect IQ player) in conjunction with a browser page on PC/laptop/tablet (running Remote Player or Session Player).
While you could run the Connect IQ player alone, you will need to make your workout selection from the Training tab at xertonline.com before starting the player.
The EBC phone apps have many more features than the Connect IQ player which is limited by the Garmin platform.
Many newbie tips are posted in this thread –
Beginner questions - Support - Xert Community Forum (xertonline.com)