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# Can the effort time vary during the training plan or be adjusted when adding a new race result to the performance history?


# The plan evolves each week based on the completion of your sessions (validating your workouts) and the RPE (the little smiley faces) you assign to them.

That’s why it’s so important to **validate your sessions in real time.** Right after your workout is even better for accuracy and detail 😉

If your plan evolves, your estimated time range can also change. This time range can also adjust if you enter a new reference race result (trail or road) in your performance history.

|| If you're new to trail running and want to take on a medium or long format race, make sure to run a trail race around one hour of effort so we can better calibrate your profile and provide the most suitable training plan for your upcoming preparation.