Later, I went to yoga class and found that many students in the class couldn't hold their feet. The teacher said that this has something to do with your poor flexibility. If your flexibility is a little stiff, you can't hold your feet. I can do this, and I think you can do it, but in some yoga classes, on the first day, your flexibility, such as those dog moves in yoga classes, can not only open your waist but also open your shoulders. You should stick to this. If you really want to bend over and scratch your feet, don't make your feet so straight in the first place. You can also bend your knees slightly. Our teacher told us that it is not good to ask questions, so don't force yourself too much, just bend your knees a little and do your best.
Then you insist on practicing yoga, and then put your own? Drive out to exercise your flexibility, and the back will be fine. It's just possible that if you can get it back now, if you don't insist, it may return to its original state. I have been doing it since I saw my roommate recently, and I think the effect is quite good. I hope you can stick to it and succeed at an early date.