Background: Psychological stress is a major risk factor for the development and progression of a number of diseases, including cardiovascular disease, cancer, arthritis, and major depression. It greatly affects both older and younger ages globally. Thus, searching for new non-drug training strategies for ameliorating psychological stress are recommended. Aim: The aim of the present study was to characterize the rate of psychological stress among students of faculty of sports sciences and to evaluate the efficacy of a particular relaxing gradual technique called progressive muscle relaxing (PMR) for ameliorating the mood and for returning the psychological stress parameters into normal levels. Methods: Psychological stress was evaluated in 40 of students of faculty of sports sciences aged... 18-21 years old. They are classified into two groups according to the scores of psychological stress; control group (n=20) and Psychological stress group (n=20). For the treatment of psychological stress, both groups participated in PMR- training intervention (2 times /week) for 12 weeks. Results: In this study, psychological stress parameters were significantly reported in 50% (20/40) of the participated students. PMR - training interventions showed a gradual significant reduction in total psychological stress scores and other related parameters; family stress, study stress, economic stress, and social stress respectively. These results greatly support the use of PMR gradual interventions for the reduction of psychological stress among younger ages. Conclusion: Application of PMR training interventions for 12 weeks gradually and significantly improve psychological stress among the students of faculty of sports sciences. It could be supported as non-drug training treatment among psychological stress holders, particularly in younger ages.