1.    Introduction
Injuries to the anterior cruciate ligament (ACL) are also on the rise among children aged 10 to 12 (1). During landing activities, children of this age show risky motion patterns (1), which include decreased knee flexion and increased knee valgus (2).  In terms of preventing and managing sports injuries, risk factors are classified as either modifiable or immutable. To prevent or reduce athletic injuries, it is necessary to manipulate modifiable factors (neuromuscular and biomechanical risk factors) in order to reduce the injury risk (3). Studies have demonstrated that individuals with poor physical fitness have a greater risk of injury (4). According to Soligard et al. (2008), the FIFA +11 warm-up program can prevent injuries in young soccer players and can reduce injuries by a third on average (5). Recently, experts at the FIFA Medical Evaluation and Research Center (FMARC) designed the "FIFA 11+ Kids" warm-up program with maturity and prevalent childhood injuries (6) in mind. This training program is intended to enhance spatial orientation, anticipation, attention, body stability, and motor coordination, as well as teach proper landing techniques (6). Numerous injury prevention programs have been devised and implemented in recent years to prevent football injuries (14-18 years). Given the paucity of injury prevention programs for athletes under 14 years of age, the current study will assess the impact of the FIFA 11+ Kids program in recent years; specifically, over the past few years.
2.    Methods
This paper provides a comprehensive review of recent research conducted on the FIFA 11+ warm-up program for children who are football players aged 7-14 years. The study examines literature published between 2016 and 2022. The aforementioned articles were searched for in Scopus, Science Direct, Google Scholar, PubMed, and Mogiran, which is a national database for journals. The English keywords that have been used are "FIFA 11+ Kids," "Prevention," "Children," "Injury," "Lower Extremity," "Performance," and "ACL."
A systematic search was conducted within the specified databases to identify relevant articles. The eligibility requirements for inclusion in the study were as follows: the article must have been published in scientific-research journals, be available in its entirety, and be written in either English or Farsi. Additionally, the article must pertain to the evaluation of the FIFA 11+ KIDS warm-up program among football players under the age of 14. The exclusion criteria encompassed studies that examined the FIFA 11+ KIDS warm-up program among individuals who were not involved in football and investigated programs for rehabilitation. Upon conducting a thorough search of the specified databases, a total of 30 articles were retrieved. Subsequently, a meticulous screening process was undertaken, whereby the titles and abstracts of the studies were scrutinized, resulting in the selection of 13 articles for further examination. Duplicate entries were also eliminated during this phase. The review utilized the results of articles that complied with the established inclusion and exclusion criteria, while disregarding those that did not fulfill the criteria (Fig. 1).

3.    Results
Table 1 displays the findings of the conducted research studies. Following the identification of relevant keywords and the establishment of entry and exit criteria for filtering articles, a total of 13 articles were eventually selected for review in this study.
Football is a high-profile sport activity among youth and adolescents, posing a significant threat of harm. This study examines the impact of the FIFA 11+ kids training program by analyzing three chosen articles, namely Al-Attar et al. (2022) which focuses on a sample of 780 players, Zarei et al. (2019) which investigated 42 teams, and Rossler et al. (2018) which examines 3895 football players under the age of 13. The main purpose of the study was to reduce the number of injuries (7-9). A total of seven scholarly articles were reviewed to examine the efficacy of the FIFA 11+ training program in enhancing the athletic performance of soccer players aged below 14 years. The aforementioned articles demonstrate that the implementation of a training program resulted in significant enhancements in various factors including balance, lower limb strength, proprioception of the knee joint, jumping, and speed skills, in comparison to the control group. These results indicate improved athletic motor function and fitness factors (7, 10-15).
4.    Conclusion
Research has indicated that the implementation of FIFA 11+ training among children can lead to a decrease in injuries and associated medical expenses for both male and female individuals who are below the age of 14 (16-17). According to Wessler et al. (2019), there was a noteworthy reduction in costs by 51% and a significant decrease in injury rates by 17% (17). Another study revealed that the FIFA 11+ program for children resulted in a 66% prevention rate for bone injuries, 49% for fractures, and 37% for aspirin and ligament injuries, leading to an overall reduction of 48% in injury rates (16). Furthermore, Zarei et al. (18) administered a 10-week training program involving two sessions per week using the FIFA 11+ program among children, and noted a favorable impact on their balance. The primary objective of the FIFA 11+ exercises designed for children and adolescents is to enhance their coordination, balance, landing technique, leg muscle strength, and core stability. These exercises may be more appropriate for pre-teens than the 11+ exercises. The efficacy of the 11+ training program in enhancing dynamic balance and jumping tests in pre-adolescent players may be attributed to the incorporation of two and three balance exercises, with a particular emphasis on unilateral exercises and jumping drills, as reported in previous research (13).
The FIFA 11+ kids program has the potential to mitigate certain factors linked to sports injuries in pre-adolescent children, as per the available evidence. This can lead to a favorable impact on internal risk factors and prove effective for preventing sports injuries.


Ethical Considerations
Compliance with ethical guidelines
This article is a review and no human or animal has been directly involved in it.
Funding
This research did not receive any financial support from public, commercial, or non-profit funding organizations.
Authors' contributions
All authors equally contributed to preparing article.
Conflicts of interest
The authors declared no conflict of interest.