Adding volume to high volume recovery weeks

Hi Sarah,
Awesome job doing an HV plan, there is a thread dedicated to HV plans you should check out.

The whole point of rest weeks is to allow your body a break from training stress and allow for a process called super-compensation or adaptation.

So that’s exactly it, your body is adapting and getting faster on this rest week. By adding extra volume, no matter how low intensity, you are adding more stress to the equation. Considering that this is the base phase and you are working to improve endurance (aerobic) you won’t be losing anything by backing off for one week. If you really want to add volume you could do it by adding Z2 after sweetspot intervals.

I just asked a question related to this on a thread about Traditional Base vs. Sweet Spot Base.