2025. 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. JUPE : Jurnal Pendidikan Mandala. 10, 3 (Sep. 2025), 1017–1027. DOI:https://doi.org/10.58258/jupe.v10i3.9327.