## 1 Introduction  
Several studies have previously observed that body posture asymmetry may cause muscle imbalance, musculoskeletal injuries, motor control impairment [1; 2; 3; 4; 5; 6] and a reduction in exercise performance in young soccer players [7]. Postural asymmetry-induced injuries might be due to early specialization and/or to premature participation in sports [8; 9; 10; 11]. Both early specialization and premature participation in sports may cause postural malignantment in young athletes since the development of their musculoskeletal system is not yet fully developed, predisposing young athletes to injury development [9; 10; 11; 12]. It was also observed that the magnitude of asymmetry-induced injuries progressively increases in young soccer players over time, being higher in older adolescent players than in younger counterparts [13]. An additional factor that has been observed to be associated with asymmetrical adaptations in bone and muscle circumferences, as well as in lower limb flexibility and in muscular strength, is the presence of laterality in sports [2; 14]. It was observed, for example, that the increased usage of the dominant leg in soccer may progressively negatively influence postural asymmetrical adaptations [15; 16] and the asymmetry between the two legs due to the single-leg landing impact [17]. However, postural asymmetry-induced muscle imbalance, muscular injuries and motor control impairments [1; 2; 3; 4; 5; 6], leading to a reduction in exercise performance [7], are potentially modifiable factors [16]. [PERSON] et al. (2019) pointed out that corrective exercises can be regularly applied for stabilizing the lumbar-pelvis complex, particularly in an attempt to protect spinal overload, during daily soccer training in young female soccer players [16]. However, apart from the study conducted by [PERSON] et al. (2019), according to the authors' knowledge, no other previous relevant study has applied any corrective individualized exercise intervention program in an attempt to correct the identified postural asymmetries of young female or male soccer players. The only attempt that has been applied to potentially alleviate postural asymmetries as much as possible, and subsequently reduce injury incidences in young soccer players, is the FIFA 11 plus, which was proposed by the International Federation of Association Football (FIFA) in 2005. The FIFA 11 Plus is an injury prevention program aiming to provide a complete warm-up during training in an attempt to prevent injuries in amateur soccer players of 14 years of age and older [18]. Indeed, studies have shown that the 8-week implementation of the FIFA 11+ program was effective in reducing the injury rate [19; 20; 21] and in improving lower limb strength and body balance [22]. However, the FIFA 11+ Program effectively targets amateur players in general, since all players perform the same exercises, particularly during the warm-up. Nevertheless, each player has different corrective-exercise needs due to different body asymmetry cases and to the dissimilar levels and degrees of postural asymmetries. Consequently, the design of a specific individualized program for each soccer player is required for targeting the personal needs of each young athlete. Although several studies have examined the relationship between body posture and injury development in young soccer players, no interventional studies incorporating individualized corrective-exercise programs (CEP) which target the correction of body asymmetries in young soccer players were located. Since postural asymmetries predispose young elite soccer players to injuries [2] and to a reduction in power performance and hamstring flexibility [7], specific corrective exercises that may be applied in an attempt to alleviate postural asymmetry incidences, and, therefore, to improve the overall musculoskeletal clinical and kinesiological health statuses of young athletes should be discovered.