When I work in a sitting position for a long time, my whole back hurts and I often stretch up. At the same time, my belly is stretched, the ribs and its plane are visible! Each time I reach higher and higher.

When I work in a sitting position for a long time, my whole back hurts and I often stretch up. At the same time, my belly is stretched, the ribs and its plane are visible! Each time I reach higher and higher.