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This study aims to: 1) Develop an Android-based learning media for the front handspring movement tailored for undergraduate physical education students at Universitas Negeri Semarang (UNNES), 2) Assess the feasibility of the developed learning media, 3) Evaluate its effectiveness in enhancing students’ handspring skills. The research employed a Research and Development (R&D) design, validated by six experts. Trials were conducted with UNNES physical education students (small-scale: 6 students; large-scale: 40 students; practicality and effectiveness tests: 49 students). Data were collected using questionnaires and handspring skill tests. Data analysis involved Aiken’s V for validity, Cronbach’s Alpha for reliability, and descriptive quantitative analysis for effectiveness.The results indicated that the developed media is both valid and reliable, with expert validation scores of 0.95 (media) and 0.93 (content). Reliability testing yielded Alpha scores of 0.892 and 0.901, respectively. Effectiveness testing showed a significant improvement in handspring performance from an average pre-test score of 75 to a post-test score of 81, with a significance value of 0.000 < 0.005. Therefore, the Android-based learning media is considered effective in improving front handspring skills among physical education students at UNNES.

Literacy is important to master in the 21st century. However, in reality, students' low literacy skills are exacerbated by the use of conventional media and the implementation of the School Literacy Movement (GLS) which is not yet optimal. This research aims to (1) analyze the validity of Aksaranesia.co as GLS media at SMPN 4 Yogyakarta City; (2) analyzing the compatibility of Aksaranesia.co as GLS media at SMPN 4 Yogyakarta City; and (3) analyzing the usability of Aksaranesia.co as GLS media at SMPN 4 Yogyakarta City. This research is Research and Development (R&D), with a waterfall model consisting of 5 stages, namely requirements and definition, system and software design, implementation and unit testing, integration and system testing, and operation and maintenance. The results of this R&D are: (1) Aksaranesia.co obtained a mean score of 3.30 on content validity, and 3.66 on construct validity, so it is very valid; (2) Compatibility testing on Android 10.0-13.0, as well as Google Developer tools shows that Aksaranesia.co is 100% compatible; and (3) Aksaranesia.co through usability testing with a percentage of 96.68% or very feasible. Aksaranesia.co is expected to provide implications in efforts to develop literacy media to support the 2030 SDGs.