Background: Athlete performance optimization in rugby is fundamental to the maximization of player potential and injury prevention. The present study examines the cumulative effects of resisted inspiratory muscle training and Nordic training on different performance parameters among male rugby players.

Methods: Experimental study design utilized with thirty male rugby players between 20 to 30 years of age, randomly divided into two groups: Group A (combined training) and Group B (control group). Group A received resisted inspiratory muscle exercises and Nordic training sessions thrice weekly for eight weeks, whereas Group B had their usual rugby training without any interventions. Performance measures, such as vertical jump test (VJT), one-repetition maximum (1 RM), and Yo-Yo Intermittent Recovery Test (YYIRT), were assessed at baseline and final study time.

Results: Group A exhibited statistically significant improvements in all the parameters of performance against Group B. Significantly, VJT values reported a highly significant rise (t = -20.75, p < 0.001), demonstrating increased lower limb power. Improvement in 1 RM (t = -18.17, p < 0.001) and YYIRT (t = -22.17, p < 0.001) further testified to greater muscle strength and aerobic endurance in the combined training group.

Conclusion: The research concludes that the inclusion of resisted inspiratory muscle exercise and Nordic training in routine rugby training substantially improves athletic performance indices. The results