Get a standing desk sitting is bad for your lower back.
Sit 20 minutes stand 10 minutes, alternate.
Consider a treadmill at your standing desk, Amble while you work.
Choose a chair that provides support for your lower back.
Adjust your work surface height and your chair to assume a comfortable and natural body posture.Sit square try not to lean to one side, it is bad to cross your legs at the level of your knee.
Try to maintain an angle of 110 degrees between your trunk and thigh when sitting, keep your knees below your hips.
Get up often even for short breaks.