Karimatul Muhsiana Andriani et al. 2025. EFEKTIVITAS COUNTERMOVEMENT JUMP DAN CALF RAISE TERHADAP PENINGKATAN DAYA LEDAK OTOT TUNGKAI ATLET VOLI DI YOGYAKARTA. Journal of Innovation Research and Knowledge. 5, 4 (Sep. 2025), 4715–4726. DOI:https://doi.org/10.53625/jirk.v5i4.11193.