Sitting with your legs crossed is not the best position for your body. So why is it such a nice attitude?
Quest answers the question in their latest edition. Crossing your legs causes the muscles that run behind your hip joint to lengthen. It stabilizes your pelvis, so you don't have to tighten your abs less to sit up straight.
In addition, it is sometimes just nice to change position, crossing your legs is a good alternative.
Read also: Is it bad to sit with your legs crossed?
Maybe it's time to pay more attention to our sitting position.