@OopNorfDahnSarf I'm still on Center and did Day 17 this evening, while doing the session, I felt it in my neck, shoulders and mid back, but now, a couple of hours later, I can feel it in my core. I didn't think I was engaging my core too much - sometimes I'm concentrating on the pose rather than the engaging.
@Yogachick sorry to hear you're so unwell, really hope you can shake it off quickly.
Welcome back @Shinyandnew2022