Hendrawan D, Ginting NB, Batubara AS, Zega AS, Tambunan ADG, Mandasari Y, et al. The Influence of Abdominal Muscle Strength and Waist Flexibility on the Long Jump Results of Male Athletes. J. Joska. Kamp [Internet]. 2024 Nov. 28 [cited 2026 Jun. 7];1(03):103-8. Available from: https://isorikampar.igiinsight.com/index.php/joska/article/view/23