The study aimed to assess the effects of a specific respiratory muscle training (RMT) program on the performance of young swimmers. A total of 23 young swimmers were randomly divided into two groups: an experimental group (GE) that underwent both swimming and RMT training, and a control group (GC) that only underwent swimming training. Both groups followed the same swimming training program for 14 weeks. Before and after the intervention, all swimmers were evaluated for body composition, maximum inspiratory and expiratory pressures, apnea test, and maximum 200m and 400m freestyle tests. The RMT program consisted of 30 maximum inspirations with a resistance load of 60% of each participant's maximum inspiratory pressure, twice a day, six days a week. The results showed significant improvements in apnea performance and swimming time within the GE. Additionally, there were significant differences between the GE and GC in the 200m freestyle test. These findings suggest that the variables studied influence freestyle performance and that a specific RMT program can effectively improve performance in young swimmers.