https://youtu.be/jiVGfMIHSyE
Sitting is comparable to smoking from an ergonomist's perspective because it slowly takes a toll on the joints, muscles, tendons and ligaments in the body as well as prevents the nervous system from functioning to it's full potential. For this reason, sitting should be minimized when possible and healthy standing or movement breaks should be utilized. However, when we sit it is important to practice proper posture to reduce the stress on our body as much as possible. Proper posture while sitting is accomplished starting from establishing our forward pelvic tilt to induce a proper curve in the low back. Once the pelvic tilt and low back curve are established, the rest of the spine follows suit and the muscles don't have to work as hard to maintain proper posture. This is accomplished by dragging the buttocks down the back of the chair in the act of sitting down so that proper forward pelvic tilt is maintained.