“PERBANDINGAN PENGARUH JACK-KNIFE STRETCHING DAN NORDIC HAMSTRING EXERCISE TERHADAP FLEKSIBILITAS OTOT HAMSTRING”. Jurnal Kesehatan Hesti Wira Sakti, vol. 11, no. 02, Oct. 2023, pp. 166-74, https://doi.org/10.47794/jkhws.v11i02.47.