Purpose: This study aimed to evaluate the impact of Fixed-Role Small-Sided Games (FRSSGs) on youth soccer players' agility and its components: reaction time, linear speed, and change-of-direction speed (CODS). Methods: Thirty-one male U-12 regional soccer players were randomly assigned to the FRSSG group (n = 16; age: 10.63 ± 0.48 years) or the control group (CON) (n = 15; age: 10.89 ± 0.31 years). The intervention program lasted 18 weeks. Pre- and post-intervention tests assessed reaction time, linear sprint speed (10 m and 20 m), CODS (505 and zig-zag tests with/without the ball), and agility (Y-shaped with/without the ball and multiple-signal tests). Statistical analysis included paired t-tests, repeated measures ANOVA, and effect sizes (Cohen's d). Results: Significant baseline differences were observed between groups in 10-meter linear speed, and zigzag test performance (p < .05). Within-group improvements were observed for the FRSSG group in the 505 Test (-6.85%, p < .001, d = 1.375), Zigzag Test (-10.77%, p < .001, d = 2.148), CODS Zigzag Ball Test (-9.42%, p < .001, d = 1.434), Y-shape Ball Test (-9.49%, p < 0.001, d = 2.195), and Agility Multi-signal Test (-8.42%, p = .002, d = 0.821). Significant between-group differences favoring FRSSG were found for the 505 Test (p = 0.005, Eta2 = 0.038), Zigzag Test (p < .001, Eta2 = 0.435), CODS Zigzag Ball Test (p = 0.004, Eta2 = 0.04), and Y-shape Ball Test (p = 0.006, Eta2 = 0.027). Conclusion: FRSSGs have been shown to effectively enhance agility and change of direction speed, both with and without the ball, in youth soccer players.
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