External Grant 1) Smart treadmill for elite athletes (Ministry of Industries and Mines) 2) Novel computerized biofeedback device (Ministry of Science, Research and Technology) Internal Grants 1) Kinematics and Kinetics of the left and right legs on the soccer instep kick. 2) Computerized multi-function dynamometer 3) Physical activity Monitoring System 4) Study on the preventive effects of Purslane extract on muscle soreness 5) Study on the ergogenic effects of high-nitrate foods on the cardiorespiratory strength and endurance 6) The effect of one-week melatonin supplementation on the biochemical and clinical parameters of DOMS