Nobody knows what caused this back pain 2 days back. A nerve was jammed. How this happened is inexplicable. It can be that I slept in a bad position. It can be that I moved awkwardly while cleaning, even though I cannot remember if I cleaned.
I felt excellent this morning and in the early afternoon I was on the mat for a primary. My back feels better than ever. This is true. I remember the sentence of Sharath. It went somehow like this: pain in life is bad pain, pain in yoga is good pain. Again I don't know if this jammed nerve was caused by yoga, but I've the feeling after this practice today as if on a deeper level something loosened. It was easy to put the legs behind the head for supta kurmasana. It was and this is indeed a surprise easy to lift me up in urdhva dhanurasana. My body felt transparent and stretchy. I didn't procrastinate. How good.
Tomorrow second series and now a hot bath.
A side mark: I added pranayama and meditation at the end.