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Objective: To compare the acute effects of a dynamic warm up and standard warm up on hamstring, quadriceps, and hip flexor flexibility, quadriceps and hamstring strength, and vertical jump height and power. Design and Setting: An experimental research design was used to compare a standard warm up (n=15), a dynamic warm up (n=15), and a control group (n=15) on acute changes after a single bout of warm up. Subjects: Forty-five physically active recreational soccer players (age = 22.13 ± 2.77 years, ht = 68.47 ± 3.77 in, wt = 73.59 ± 14.53 kg) volunteered to participate. Measurements: Flexibility, strength, vertical jump height, and vertical jump power were evaluated. A mixed model analysis of variance was used for statistical analyses. Results: The dynamic warm up significantly increased hamstring flexibility from pre test measures (p < 0.0001) and significantly increased eccentric quadriceps peak torque (p = 0.012). Furthermore, a trend indicated that the dynamic warm up increased concentric quadriceps peak torque from pre to post-test measures. No other variables were significantly impacted by any warm up group. Conclusion: Our results suggest that an acute bout of a dynamic warm up improves hamstring flexibility and eccentric quadriceps strength. Future research should investigate the effects of a dynamic warm up on reducing muscular injury rates. Key Words: Dynamic warm up, hamstring flexibility, quadriceps strength, reciprocal inhibition.