Welcome @AgnesTeaHouse i finished absolute beginner recently, thanks to this lovely group for the suggestion. I didn’t really get DOMS either. Apparently some workouts are deliberately designed to give people DOMS so they give the impression they have delivered an effective workout - no idea if that’s true, I have been watching a lot of random fitness stuff on YouTube! But interestingly with those types of workouts the presenter doesn’t do the full workout they stop and talk a lot so probably won’t get the DOMs themselves, whereas Caroline is doing the full workout with us and including appropriate rests. I have seen improvements in a lot of things since starting including push-ups - I still can’t do a full one, but getting better! By the way I found the warm up super hard (perversely enjoyed it be the end 🤣) but the epic warm up on you tube is much much easier. However as a runner it might be much easier for you than me!
I am almost done with week 3 iron, just workout 15 to do. I had one or 2 days where I felt super strong but also had some really bad days where I was shaky with light weights. I think this might be blood sugar related.