Hendriko, Tirza Z Tamin, I Nyoman Murdana and Aria Kekalih 1. Hamstring Muscle Flexibility among KONI Volleyball Players of DKI Jakarta Province – A Pilot Study for Sport Injury Prevention. Indonesian Journal of Physical Medicine and Rehabilitation. 2, 01 (1), 115 - 131. DOI:https://doi.org/10.36803/ijpmr.v2i01.233.