If you follow a Low-Volume (LV) custom plan from Plan Builder, you can add endurance rides anytime. With AT, the endurance rides will change your progression levels, which will help in inform the recommended adaptations; however, AT will only adapt future workouts on the LV plan (not any rides manually added to the Calendar). Let’s say you’re following an LV plan and complete a manually added endurance ride on the weekend. Let’s imagine that endurance ride increases your progression levels in your Endurance and Tempo zones from 4.5 to 6 in both cases. If the next Endurance or Tempo workout on your LV plan was scheduled as Productive for at a progression level of 4.5, AT would adapt that workout to be Productive for a progression level of 6, meaning it would suggest a more challenging Endurance/Tempo workout. Any manually added endurance rides on the Calendar would remain unaffected. Does that help?