Effectiveness Of Training Cost Method Of Using Serial And Parallel To Increase Power And Leg Muscle Strength, Muscles Back, Stomach Muscle. Jurnal, Pendidikan [Internet]. 2018 Dec. 7 [cited 2026 Jun. 18];3(3):312-6. Available from: https://ejournal.mandalanursa.org/index.php/JUPE/article/view/588