Hi @hmeldgard, not exactly. Xert can detect when you’re about to fail (if MPA is close to your current power output), but it doesn’t intervene to reduce the intensity before you hit failure. Instead, the SMART workouts are designed in such a way to bring you to a specific point of fatigue (or recovery) before continuing - most of the workouts in our library will never intentionally bring your to failure (with the exception of Breakthrough workouts).
Yes, the apps all come with workout scaling, so you can adjust the intensity of the targets up or down, depending on the day.