Yulianti, A.; Yunia Harlin Indarti, B.; Aulia Rahmadanti, R.; Ainun Ma’rufa, S.; Imanurrohmah Lubis, Z. The Effect of Strengthening Ball Roll Exercise on the Static Balance and Flexibility in Children With Flatfoot at 4-6 Years. Kme 2023, 3, 276–283.