Cecilia Novyanti Sitompul. Modification of Breast Stroke Leg Movement Exercises in Extracurricular Swimming Courses at Yos Sudarso Junior High School. IJEL [Internet]. 2025 Jun. 23 [cited 2025 Aug. 18];4(2):41-7. Available from: https://ijel.asia/index.php/ijel/article/view/228