Development of trainer AI learning media based on Android application to improve beginner tennis groundstroke skills. - aksir, Muh. Ilham; Suherman, Wawan Sundawan; Alim, Abdul; Hasmyati, Hasmyati; Syafruddin, Muhammad Akbar; prasetyo, Yudik; Nurhidayah, Dewi (Retos: Nuevas Perspectivas de Educación Física, Deporte y Recreación, 2025)