Effect of nutritional status and parents' income on physical fitness of elementary school students. - Sepriadi; Syafruddin; Khairuddin; Alnedral; Bafirman; Rifki, Muhamad Sazeli; Ihsan, Nurul; Eldawaty; Hayati, Sri Reski; Pratiwi, Hilda; Pratiwi, Monica Dara; Chaeroni, Ahmad (Retos: Nuevas Perspectivas de Educación Física, Deporte y Recreación, 2024)