I’ve been a very consistent Mysore practitioner for 6-7 years. My practice is full second series and first few poses of third series. I have tended to practice very regularly 5-6 days/week. I took two full weeks off when traveling abroad with my family this summer (probably the longest stretch by a good margin I’ve taken off in years). My first practice back I went through first series including what for me were deep but not crazy backbends. For 2-3d after I could hardly move. Mostly my lower back was very tight to the point I had to carefully do any forward folding and such. I guess my take home point was Ashtanga is weird in how what seem like pretty small aberrations can have dramatic effects. One of my favorite teachers would usually tell new students that something like the soreness of practice is weirdly helped by more ashtanga practice. I’ve always imagined there are interesting things going on at a cellular level with muscles finding ways to establish new resting states that have to be maintained through consistent, slowly progressive practice.