OK, after reviewing the workout, here is what is required. As you note, the power target does drop, so depending on trainer mode and setup you have to do one of the following:
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If in ERG, you increase your cadence at each directed change in the instructions, and simple spin faster. The trainer will adjust to meet your actual cadence and the power target.
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If in Resistance, Standard or on a traditional non-smart controlled trainer, you must shift to an easier gear in order to increase your cadence in accordance with the instructions. This may require more shifting since the higher cadence also happens along with a reduced power target. So it may take 2 or more shifts to hit the power and cadence goals.
Keep in mind power is the main goal, with cadence as a secondary one, so if you can’t hit both, aim for power and let cadence deviate as needed.
These are essentially just a simple drill to work on getting to faster and more fluid cadence, so use either method above if the cadence goal is something you think you want to add. None of these drills are required, and they can even be altered if you know you have different needs or preferences.