# User Assessment of a Customized Taekwondo Athlete Performance Cyber-Physical System
## 2 Methodology
### The SPERTA System  
This study is based on a system specifically designed to evaluate the performance of Taekwondo athletes in real time. In order to meet the requirements defined for the work, a system architecture has been designed that combines a series of elements with specific characteristics whose objective is to create a tool capable of performing what is proposed. The SPERTA cyber-physical system is an innovative initiative that aims to develop a real-time assessment system for evaluating the performance of Taekwondo athletes. Its main objective is to provide coaches with a reliable and affordable system to evaluate and analyze athletes' performance in real time. The purpose of this work is to improve training techniques and the overall development of Taekwondo practice. The overall system, developed as part of SPERTA, consists of a 3D camera, the Orbbec Astra with RGB (red, green, blue) and depth sensors [32], inertial measurement units (IMUs) with an accelerometer and a gyroscope, and a computer for data acquisition and processing. This setup makes it possible to obtain detailed information such as the Cartesian coordinates and speed of the hand and foot movements performed by the athletes and to provide coaches with accurate feedback to correct or improve an athlete's technique by displaying the data in real time. The SPERTA system aims to improve training and assessment methods for Taekwondo martial art athletes using technology and movement analysis. The system allows users to capture and analyze movements without the need for markings on the human body, optimizing it for better monitoring and improvement of the athlete's performance under normal training conditions. Allowing users to identify and record the movements performed, the system displays the values of speed, acceleration, and force of the athlete's upper and lower limbs in real time. In order to achieve that goal, it collects data on the athlete's movements, which are analyzed and processed in order to present relevant information in real time. This information consists of the following elements: values of speed, acceleration, and strength of movements; accounting and identification of movements performed by the athlete during the training session; storage, visualization, and export of training data performed by the athlete. The availability of these data in real time, or at any time by accessing the system, allows the coach and athlete to quickly adjust training methods, enabling a rapid evolution of the athlete's performance. This does not happen using traditional methodologies that depend on visual analysis, sometimes later through video analysis, which is more prone to errors. Thus, the equipment of the system consists of a computer, preferably portable, compatible with the Windows operating system [33], and a 3D camera sensor. The Orbbec Astra camera [32] was utilized for this research. The computer was equipped with specially designed software for the SPERTA system, enabling data collection and processing. Additionally, the system incorporated IMUs that were specifically developed for this purpose. These IMUs consisted of an ESP8266 wireless microcontroller 802.11 (Wi-Fi) microcontroller development board [34], a GY 521 MPU 6050 accelerometer and gyroscope [35], and a 3.7 V 190 mAh Li-Po battery (refer to Figures 2 and 3). The development of the SPERTA cyber-physical system was driven by the consideration of cost-effectiveness and practicality in a real-world setting. It was crucial for the system to be minimally intrusive for Taekwondo athletes. To achieve this, careful attention was given to selecting hardware components that were readily available and designing a system that was both practical and user-friendly. This encompassed ensuring a seamless user experience and creating comfortable and lightweight equipment to facilitate ease of use. The positioning of the sensors on the athletes can be observed in Figures 4 and 5.