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The subjects of this study were high school baseball team players who had consent from April 2017 to June 2017 out of the top 32 schools in the Saitama prefecture high school baseball championship last year. Exclusion criteria were those with injuries during treatment. All players were randomized due to the risk of team-based practice affecting the results. Randomization was achieved using the envelope method. The randomized procedure was performed by drawing a sealed opaque envelope and drawing a sealed opaque envelope containing that specific assignment group (intervention or control group). The number of envelopes, including assigned groups, has been adjusted to match the number of players. The procedure was took in June 2017. Even if the target number of subjects was not reached, we decided to conduct the research with the number of subjects that could be collected. There was no significant difference in the characteristics of participants between the two groups.Age, height, weight, period of baseball experience, dominant hands and field position of the participants were recorded by a questionnaire. From September 2017 to March 2018, FMS score, eyes closed single leg stance time, fatigue over the previous week, pitching ball speed and baseball performance were also measured before the intervention, and at 8, 12 and 24 weeks after the intervention in their field. The FMS comprised 7 tasks including deep squat, hurdle step, inline lunge, shoulder mobility, active straight leg raise, trunk stability push-up, rotary stability. Each task was carried out using the standard FMS measurement kit (1.2 m bar, 2 of 60 cm bar, 5 x 15 cm box). Seven movement tasks were scored with a maximum of three points per task. For balance ability, single leg stance time of dominant leg was measured with eyes closed (the right foot when right pitching). During this test, hip and knee joints were set at 90 degrees on elevated leg with barefoot of standing leg and both upper extremities attached to the body side. During the measurement, the time was recorded at the point the subject could no longer hold the upper and lower extremity and the test was repeated twice with the maximum value recorded. Next, fatigue in the previous week was measured on 11 point numerical rating scale (NRS) anchored at 0 as no fatigue and 10 maximum possible level of fatigue. Pitching ball speed and control were used to evaluate baseball performance using each player's preferred method of pitching. The pitching protocol was set to 3 and 20 fastball pitches at maximum effort toward the simulated strike zone at the official distance of 18.44m. We recorded the fastest ball velocity from 3 pitches using speed gun (SR3600; Sports Radar Ltd., Homosassa, FL, USA), the number of strikes out of the 20 pitches and pitches that were less than 70% of the maximum speed value were not included. The measurement commenced after the participants performed a preparation routine of stretching and warm-up throwing. In the control group, all players practiced normally and there was no limit on voluntary baseball training. In the intervention group, FMS training for tasks that were scored at 2 points or less in the FMS was carried out 4 times per week for 12 weeks from September 2017 to November 2017. Following this, normal activity without performing FMS training continued for 12 weeks as the follow-up period after the initial 12 week intervention. FMS training for 15 minutes a day was conducted after practice and before cool down. However, due to the lack of specialized equipment in high schools, we adopted training that could be implemented with simple equipment such as towels, cushions and sticks as used in previous studies, and according to the official website of FMS. The training was set based on the result of each player's FMS score. In addition, The researcher demonstrated the FMS training program using a video recording. Players were asked to record relevant data daily during the investigation. In addition, a representative was elected at each high school, who was tasked to ensure that data was properly recorded and who checked the implementation at least once every two weeks. FMS training compliance was calculated by dividing the actual FMS training date by the planned period of date. All physical function assessments were performed by the research team and the measurers were blinded. Approval to participate in this research was sought from the principal and coach of each high school. All players were provided with written information about the research prior to obtaining consent. After confirming that they understood the research, approval was sought from the player’s parents with a signed consent form. The study was approved by our institutional review board, the Ethics Committee at the Faculty of Health and Medical Care, Saitama Medical University, Japan (M-75). Registered as a trial registration at the University hospital Medical Information Network Center, Tokyo, Japan本研究的研究对象为2017年4月至6月期间签署知情同意的、来自去年埼玉县高中棒球锦标赛前32名学校的高中棒球队员。排除标准为正在接受治疗的伤病球员。由于团队集体训练可能对研究结果产生影响，所有球员均采用随机分组方式。随机分组采用信封法完成：通过抽取密封不透明信封，获取包含具体分组（干预组或对照组）的密封不透明信封。信封总数（含分组标识）已调整至与球员人数匹配。随机分组操作于2017年6月完成。即使未达到预设样本量，本研究仍将采用实际招募到的受试者人数开展研究。两组受试者的基线特征无显著差异。 通过问卷调查记录受试者的年龄、身高、体重、棒球运动年限、利手及场上位置。2017年9月至2018年3月期间，在干预前、干预后第8、12及24周，于受试者的训练场地分别开展以下评估：功能性动作筛查（Functional Movement Screen, FMS）评分、闭眼单腿站立时间、过去一周疲劳程度、投球速度及棒球运动表现。 FMS包含7项动作任务，分别为深蹲、跨栏步、直线弓步、肩关节活动度、主动直腿上抬、躯干稳定俯卧撑、旋转稳定性。每项任务采用标准FMS测试套件（1.2米横杆、2根60厘米横杆、5个15厘米方块）进行评估，每项任务最高得分为3分。平衡能力评估采用闭眼单腿站立测试利腿站立时间（右投手对应右脚）：测试时，支撑腿赤脚，髋、膝关节呈90度屈曲，非支撑腿抬起，双上肢贴于身体两侧。当受试者无法维持上下肢姿态时停止计时，每项测试重复2次，取最大值记录。 过去一周的疲劳程度采用11点数字评定量表（Numerical Rating Scale, NRS）进行评估，锚点0代表无疲劳，10代表最严重的疲劳程度。棒球运动表现通过投球速度与控球能力进行评估，采用每位球员偏好的投球方式。投球测试方案为：以最大全力向模拟好球区投出3组快速球，每组20次，投球距离为官方标准的18.44米。使用测速枪（SR3600; Sports Radar Ltd., Homosassa, FL, USA）记录3次投球中的最快球速；统计20次投球中的好球数，且球速低于最大速度70%的投球不计入统计。测试前，受试者需完成拉伸及热身投球的准备流程。 对照组球员仅进行常规棒球训练，无自愿训练的限制。干预组球员则针对FMS评分≤2分的动作任务，于2017年9月至11月的12周内，每周开展4次FMS训练。完成初始12周的干预后，进入12周的随访阶段，此期间受试者恢复常规活动，不再进行FMS训练。每日训练时长为15分钟，安排在常规训练结束后、放松整理前进行。由于高中缺乏专业训练器材，本研究采用既往研究及FMS官方网站推荐的、可使用毛巾、软垫、棍棒等简易器材开展的训练方案，训练内容基于每位球员的FMS评分结果制定。此外，研究人员通过录像演示FMS训练方案。 调查期间，要求球员每日记录相关数据。每所高中推选1名代表，负责监督数据正确记录，并至少每两周检查一次训练执行情况。FMS训练依从性通过实际训练天数除以计划训练总天数计算得出。所有身体功能评估均由研究团队完成，测试者采用盲法设计。 本研究已获得各高中校长及教练的参与许可。在获取知情同意前，向所有球员提供书面研究说明。在确认球员理解研究内容后，需获得其家长签署的知情同意书。本研究经日本埼玉医科大学健康与医疗护理学院伦理委员会（批准号：M-75）审查批准。本研究已在日本东京大学医院医疗信息网络中心完成临床试验注册。