Noor Noveminaila N, Soegiyanto S, Rahayu S. The Effect of Arm Strength, Leg Muscles, Torso Flexibility on The Improvement of Butterfly Stroke Swimming Exercise. JPES [Internet]. 15Apr.2020 [cited 6May2024];9(2):166-71. Available from: https://journal.unnes.ac.id/sju/jpes/article/view/41077