غادة هادي جاسم and ا.م .د محمد رحيم غاوي 2024. The effect of Keeler’s model on the development of motor flexibility and learning to serve in tennis. Journal of the College of Basic Education. 29, 122 (Jan. 2024), 329–313. DOI:https://doi.org/10.35950/cbej.v29i122.11114.