Almowafi, H. A. E., Elgendy, A., Mowafi, M., Elbahrawi, M. (2020). 'The effect of an educational program using Hypermedia on improving the level of technical and digital performance of crawling swimming on the abdomen for third year students, Division of Physical Education Teaching in Mansoura University', The Scientific Journal of Physical Education and Sports Sciences, 39(1), pp. 135-164. doi: 10.21608/ejsk.2020.35614.1002