IRCT2016082429512N1 IRCT 2017-08-02 Vice chancellor for research,Tarbiat Modares University tentional exercise developed pender model Designing and evaluation of an educational program based on developed pender model on changing tentional exercise for reducing musculoskeletal pain among office workers 2016-08-22 anticipated 420 Complete https://irct.ir/trial/23707 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention, Other design features: A randomized study uses a random number table. The intervention program is designed based on the predictor variables of the developed Pender model. The educational contents include tensile muscle training, shoulder and shoulder muscles, waist and neck muscles. The software used in Ergo Pro office computers includes special stiffening exercises related to shoulder, shoulder and shoulder behavior in the workplace: is used (a series of four preparations for neck, shoulder and hand and Forearm, 5 for the waist). N/A Stretching behavior. Intervention 1: Intervention group: Organizing an 8-person training class in 7 groups with group discussion and surrendering thoughts to improve self-efficacy, reducing perceived barriers and improving commitment to behavior for 4 hours in two sessions of a 2-hour session. Follow up the intervention group with 10-weekly reminders. Installing the software to remind stretch marks by registering a checklist. Follow up of this group to complete questionnaires at specified intervals And will be sent stretching exercises movie and posters via blogs. Intervention 2: Control group: did not receive training on the topic of stretching exercises. Follow up of this group only to complete questionnaires at specified intervals.