Stiawan, M., Suwarni, S. and Sumantri, A. 2026. The Effect of Fartlek Training on Endurance in Runners at the Semarak Athletic Center. Educative Sportive. 7, 2 (Aug. 2026), 227-230. DOI:https://doi.org/10.33258/edusport.v7i2.11627.