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Exactly how did you do or add this to your TR calendar?
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What was your Endurance PL before this workout and how did you rate that workout?
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What phase are you currently in (presumably Phase 1)?
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What are the Workout Levels for the upcoming Endurance workouts?
As you can see, there are a number of details here, and likely more that I haven’t even touched upon. When in doubt, an email to TR is likely the best step for questions like this since they have direct access to so much more than we have on the forum, even when you provide decent info.