Ghanim, Maysaa. “The Effect of Problem-Based Learning Instructional Units on Acquiring the Kip-Up Skill on the Horizontal Bar”. Journal of Physical Education 37, no. 3 (September 28, 2025): 917–924. Accessed July 1, 2026. https://jcope.uobaghdad.edu.iq/index.php/jcope/article/view/2189.