Maulana , M. I. A., S. Sumartiningsih, and I. Setiawan. “Core Strength Training, Balance to Increase Togok Flex and Leg Strength in the Elderly in Semarang”. JUARA : Jurnal Olahraga, Vol. 8, no. 1, Mar. 2023, pp. 611-23, doi:10.33222/juara.v8i1.2945.