Fitness Planner or Improvement rate?

On the Goals tab, I shall select if predictions shall be based on Fitness Planner or Improvement Rate.
I havent been able to find a description of the two scenarios, and what effect it has on the planning.
Anyone that can point me in the right direction?

I think that if you actually fill your schedule / planner with (recommended) workouts up to your target date, you will get estimates based on that. If you do not fill your planner, you will get a prediction based on your improvement rate and decay method. So, ā€˜fitness plannerā€™ is only meaningful if you fill your calendar, otherwise ā€˜improvement rateā€™ will give you a more accurate estimate.


Thanks. I am not actively using the planner, so I will leave it on improvement rate, I guess it was the default.