Noor Noveminaila, N., Soegiyanto, S., & Rahayu, S. (2020). The Effect of Arm Strength, Leg Muscles, Torso Flexibility on The Improvement of Butterfly Stroke Swimming Exercise. Journal of Physical Education and Sports, 9(2), 166-171. Retrieved from https://journal.unnes.ac.id/sju/jpes/article/view/41077