Hodijah, R. Handoyo, and R. T. Kartadinata. “Effectiveness of Adding Lower Extremity Isotonic Exercise on Hamstring Flexibility of Hajj Pilgrims Who Receive Walking Aerobic Exercise”. Indonesian Journal of Physical Medicine and Rehabilitation, Vol. 13, no. 01, June 2024, pp. 10 -19, doi:10.36803/indojpmr.v13i01.406.