PERBANDINGAN PENGARUH JACK-KNIFE STRETCHING DAN NORDIC HAMSTRING EXERCISE TERHADAP FLEKSIBILITAS OTOT HAMSTRING. JKHWS [Internet]. 2023 Oct. 30 [cited 2026 May 5];11(02):166-74. Available from: https://jkhws.itsk-soepraoen.ac.id/index.php/jkhws/article/view/47