Proper writing posture
Always sit on a good chair with comfortable back support. Make sure your legs are flat on the floor, and do not sit with your knees to the side. Pull the chair towards the table, but leave enough space to freely move your body. This can prevent you from rounding back and help balance your shoulders.
Study carefully on the images on how to sit properly. This is essential to learn before you start writing. We spend long time practicing and it will have a negative effect to our bodies. Make sure to sit up straight and balance our shoulders to avoid limiting our scope of work and getting muscle pain in the future.