Figure 2 Overview of the mobile application interface and tele-rehabilitation intervention workflow. (A) Main dashboard displaying the initial user landing interface of the application. (B) Training selection screen for choosing between the guided breathing exercise module and the respiratory muscle training module. (C) Guided breathing exercise sequence: (C-1) exercise list and initiation screen; (C-2) guided instructional video interface displaying a comprehensive program of stretching, strengthening, aerobic, and cool-down exercises; (C-3) post-exercise rating screen for perceived exertion (RPE) used for dynamic difficulty adjustment. (D) Gamified respiratory muscle training sequence: (D-1) selection interface for various respiratory training types; (D-2) interactive gamified training screens providing real-time visual feedback based on Spirokit’s pressure sensor data.