Exploring the effects of combined Nordic and reverse Nordic hamstring exercises on physical fitness in prepubertal male soccer players

The findings showed moderate group-by-time interactions for all fitness measures [effect size (d) = 0.62-1.16]. <i>Post hoc</i> analyses revealed small-to-moderate improvements in the eccentric training group across all performance measures (d = 0.31-1.18), while no significant changes were observed in the control group for any fitness measure. In conclusion, our findings support the effectiveness, practicality, and safety (no injuries reported) of the eccentric training program for improving physical fitness in prepubertal male soccer players.