Análisis biomecánico de la carrera y el salto en niños de segundo grado de la enseñanza primaria Mariesly Guerra Hernández, José Rodolfo López Alonso Abstract: The research was based on the execution of a two-dimensional (2D) study of the biomechanical characteristics that determine the effectiveness of running and jumping in second-grade children at Eduardo Pérez Sánchez School in Las Tunas province. It follows a qualitative approach supported by analytical methods and videographic techniques using Kinovea 0.9.5 software. The study employed theoretical and empirical methods, including analysis-synthesis, inductive-deductive reasoning, and measurement. The obtained results revealed limitations in the teaching and learning process of these locomotor skills, which contribute to the establishment of incorrect movement patterns. The primary deficiencies were identified in the foot-heel impact during running and pelvic retroversion during vertical jumping. Key...