The cross legs
When they have to go places to meet people who are older than sitting cross-legged may be to look with great personalities that on the other hand, it makes them look disrespectful, as if posing over.
Leaning Forward
It makes they seem exhausted and has concerns with problems in their life. Moreover, the bend and wrap is bad health of the spine.
Moreover, sitting bent rear too lose their personality and can cause adverse effects on the body.