A tool that calculates the traction of lower back according to the posture of the worker. It has a big potential in the industries where workers have to lift heavy things. During the past years, people have been aware of the underlying threat that may cause back injury from lifting. Unfortunately, there wasn't a tool to tell them what postures and weight are safe. This app, consequently, is a very handy and authenticated tool to evaluate the back load force in labor-focused industry.