exercise ring on apple watch not recording correctly

I have an Apple Watch Series 7 running watchOS 11.6 It is not recording exercise correctly. It used to record a brisk walk as exercise but now I need to be actually running. It does record all the other metrics in Activity. I have cleaned the back of the watch with alcohol, made sure it was correctly tight on my wrist, etc.

Anyone have this issue recently? (August 2025)