The sitting position, especially for long periods, was found to be the most important factor in connection to lower back pain [10, 29]. In order to improve the student's sitting position many researchers have proposed ergonomically designed [26, 6, 30, 31], adjustable school furniture [2]. Furthermore, along with the adoption of ergonomic furniture [32], suggested the provision of educational instructions to both students and teachers about the proper adjustment of the furniture. A research shows that the students provide accurate services at the desk [33].