BACKGROUND: The present study was carried out with the aim of examining the effects of swimming training of 4 different styles (Free, Backstroke, Breaststroke, and Butterfly) for 12 weeks in adolescents regarding some motor skills. METHODS: Thirty-two volunteer athletes divided in 4 groups participated in the study; Freestyle group (FSG, N.=8) with a mean age of 12.00±1.06, backstroke group with 11.50±1.41 (BSG, N.=8) and Breaststroke group with 11.75±0.88 (BRSG, N.=8) and Butterfly group with 11.62±1.18 (BG, N.=8). Each group performed 5x25 m at maximum speed according to each swimming technique 4 times a week for 12 weeks and between sets full resting principle was applied. Pretests and posttests are applied to all subjects participating in the study. SPSS 22.0 package program was used for statistical analysis of the obtained data. The Wilcoxon Signed-Ranks test, which was a nonparametric test, was used to compare pretest and posttest values of the subjects, and the Kruskal-Wallis test was performed to determine the difference between the groups. The Mann-Whitney U test was used to determine which group was causing the difference. Significance level was considered as (P<0.05) and to state the difference between the groups lettering method was used. RESULTS: When the pretest-posttest parameters of the groups were compared; FSG pretest and posttest results showed that H (Height), BW (Body weight) and HR (Hand reaction) parameters were similar. Considering 50 m and 25 m measurements, it is found that PU (Push up), BAH (Both arms hanging), BASS (Both arms straight static), BABS (Both arms back static), HSS (Handstand static), SASS (Single arm side static) had meaningful increase (P<0.05). BSG pre-test and post-test H, BW and HR parameters were similar, the increase in PU, BAH, BASS, BABS, HSS and in SASS, were respectively meaningful (P<0.05) at 50 m and 25 m level. The pretest and posttest of BRSG in terms of H, BW and HR parametres were similar and the results regarding PU, BAH, BASS, BABS, HSS and SASS were significant (P<0.05) at 50 m and 25 m level. There was no significant difference in pretest and posttest measurements at H, BW and HR levels but a meaningful (P<0.05) increase was found in PU, BAH, BASS, BABS, HSS and in SASS regarding 50m and 25m parameters. When the pre-test and post-test differences between the groups were examined, it was found that there was a significant difference between the FSG, BSG, BRSG and BG in 50 m and 25 m measurements (P<0.05). CONSLUSIONS: As a result, the maximal style swimming training applied on 4 different styles for 12 weeks resulted in significant increase (P<0.05) in all groups in terms of measured motor characteristics, but this increase is not significant among the groups.