Introduction: Plyometric training has become a popular training method of youth soccer players. Researchers have sought to use different forms of training to maximize performance responses. Aim of the Study: This study examined effects of a vertical versus horizontal plyometric jump training program on physical performance of adolescent male soccer players. Material and Methods: Thirty participants, aged 14.2 ± 0.7 years, were divided into a vertical group (VG; n = 10), a horizontal group (HG; n = 10) and a control group (CG; n = 10). Before and after 12 weeks of training, as well as after 4 weeks, anthropometric characteristics, sprint/repeated sprint ability within straight speed tests, speed tests with 180° turns (RSAbest/mean/total), vertical jumping ability, and the 5-repetition maximum (5-RM) load in leg curls and split squats (single right/left leg) were measured. Results: The VG and the HG improved significantly (p < 0.05) compared to the CG in speed tests with 180° turns, RSAbest/mean/total sprints, squats/countermovement jumps, drop jumps` contact time, leg curls, and split squats (single right/ left leg). Conclusions: Adding vertical or horizontal training exercises twice a week to regular soccer training improves speed, jumping ability and maximum lower limbs strength in youth soccer players.
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