Comparison Of The Effect Of Training Using Aid And Without Aid On The Speed Of 50-Meter Butterfly Stroke In Athletes Of Bina Tirta Swimming Club Medan. Jurnal, Pendidikan [Internet]. 2025 Sep. 2 [cited 2026 Jun. 21];10(3):1017-2. Available from: https://ejournal.mandalanursa.org/index.php/JUPE/article/view/9327