Hello guys,
I am having this problem that I can't get into any sitting meditation postures. The problem is not such kind of flexibility, but that my back is slouched while engaged in a sitting posture. I was doing meditation last year several months and didn't experience such problem (either I was sitting with a slouched back and didn't feel it, or I managed to sit actually straight). The back is not becoming slouched in time while in meditation, but I just can't have my back straight. Maybe it's easier to explain with pictures:
This is what I want to achieve:
and this is what happens:
While it looks almost straight, I have to struggle all the time very much to keep it in such position, and eventually I end up slouching/or just thinking about how to keep a straight spine.
I have no idea what happened since last time, but so far I only see a possibility to meditate sitting on a chair. Suggestions and any other help is very appreciated.