## 1 Introduction  
Functional Movement Screening (FMS) is a widely recognized and highly regarded screening instrument used to assess an individual's exercise capacity and identify the potential risks of sports injuries. It involves a comprehensive evaluation of fundamental movement patterns, including deep squat, hurdle step, in-line lunge, shoulder mobility, active straight leg raise, trunk stability push-up, and rotary stability. FMS also examines mobility, stability, and asymmetries in the body, utilizing a standardized scoring system to assess movement quality and identify areas of concern. FMS has gained immense popularity in recent years due to its holistic approach to assessing movement quality and injury risk. By analyzing deviations from ideal movement patterns, FMS provides valuable insights into an individual's functional movement capabilities, including strength, flexibility, and motor control. This information is instrumental in guiding injury prevention strategies, training programs, and rehabilitation protocols. The application of FMS extends to various domains, including sports training, injury prevention, and rehabilitation. Numerous studies have demonstrated its effectiveness in evaluating sports performance and reducing the incidence of musculoskeletal injuries. For example, [PERSON] et al. utilized FMS to assess sports performance and musculoskeletal pain in college students, highlighting its utility in identifying areas for improvement and addressing potential injury risks [1]. Similarly, [PERSON] et al. successfully employed FMS assessment to reduce knee injuries among table tennis players, showcasing the role of FMS in optimizing movement patterns and minimizing the risk of sports-related injuries [2]. By identifying limitations and imbalances in movement patterns, FMS enables targeted interventions to address specific areas of concern. This comprehensive approach helps individuals improve their functional movement, enhance athletic performance, and minimize the risk of sports injuries. Indeed, FMS has become a valuable tool in optimizing physical well-being and promoting long-term athletic success. On-site evaluation is the most common method in FMS. An expert observes each subject's movement. However, on-site evaluation is time-consuming and labor-intensive, and the subjectivity of expert affects the accuracy of the results. Researchers have experimented with other functional movement data collection methods to address these issues. [PERSON] et al. used seven nine-axis inertial measurement units (IMUs) method to collect joint angle information of functional movements [3]; [PERSON] et al. used a Vicon motion capture system to collect joint angle and joint position information of functional movements [4]; and [PERSON] et al. collect video data of FMS assessment movements by using two 2D cameras with different viewpoints [5]. Although these devices have high-precision motion capture capabilities and enable fast and accurate assessments by analyzing large amounts of motion data, traditional motion capture systems such as IMU, Vicon, and OptiTrack require invasive operations such as tagging or wearing sensors on the subject [6; 7; 8], which are not only tedious but may also interfere with the subject's movements. At the same time, the high price of these devices limits their popularity and diffusion in fields such as sports medicine and rehabilitation therapy [9]. As the field of movement quality assessment continues to evolve, some methods of data acquisition using depth cameras are beginning to emerge. [PERSON] et al. used a Kinect V1 depth camera to collect 3D skeletal data for standing shoulder abduction, leg lift, and arm raise [10]. [PERSON] et al. used a Kinect V2 depth camera to capture 3D skeletal data and videos of healthy subjects and patients with motor disabilities performing squats, arm extensions, and trunk rotations [11].