I would like to confirm how to execute the Endurance Runs in my Marathon Level 1 programme. The guidance is for Zone 2, and to finish feeling like one _could_ accelerate at the end. What is not clear is whether or not the Zone 2 segment should be run in the same way as Foundation Runs, i.e., to RPE of 3.
What I am second-guessing is whether there is a difference between Endurance and Foundation Runs. The former is about completing the distance in Zone 2 with capacity to spare, whereas the other is to get the mileage in any Zone?
There is a difference between Foundation and Endurance runs from the author perspective. Foundation runs are to be performed nice and easy, RPE of 3 on a scale of 1-10 which would be the low end of Zone 2, even high Zone 1 is acceptable. Endurance runs can be any point within Zone 2.
But, this is a really fine distinction. If you ran both in the middle of Zone 2, that’s a success for either type. The fine print is to distinguish them.