If you have not yet purchased these, or want to try out a few works outs before you buy them, you can also choose to generate workouts that do not include them.
To do this first tap on "Select Workout" from the main workout home screen. When the following screen prompts you to choose a length of workout tap on the three lines in teh top right hand corner. A side menu slides out where you can switch Elastic resistance Bands to Off.
You can now choose your length of workout as normal.
Please note, this button will reset each time and so you will need to set it to off again before the next workout.