Background: Static stretching and dynamic stretching are two types of popular stretching principles used as a part of the warm-up, believed to increase performance and reduce injury risk. However recent evidence seems to suggest otherwise depending on what type of activity being performed and what type of stretch being used. Previous research have shown that static stretching lowers power and strength while dynamic stretching works the opposite way and has been shown to increase performance. Most of this research has however been performed on lower extremity. Aim: this study aims to compare how static-, dynamic- and no-stretch warm-ups affects power output in the upper body strength exercise bench press. Methods: Seventeen male subjects age between 21-40 years, were recruited out of two different gyms. They had at least one year experience from strength training and were all free from injury. The different warm-up interventions were performed on three different days followed by testing the power output in bench press measured in watt. The subjects were stretching the pectoralis major muscle with dynamic stretch (DS), static stretch (SS) or with no stretch (NS) standing in front of two posts. The bench press test consisted of three sets of one repetition at 60% of one repetition maximum (1RM).Friedmans test was used for analysing differences between the interventions. The level of significance was set at p < 0.05.  Results: No significant difference was discovered between the different warm-up interventions. The mean power production in bench press were 432, 418 and 423 watt for DS, SS and NS, respectively. There were no significant differencesbetween the three warm-up interventions (p=0.12). Conclusion: In conclusion, the bench press power performance was not effected by any of the different warm-up interventions focusing on stretching the pectoralis major muscle in resistance trained males.