M. S. Antoni, G. Guntur, R. Festiawan, A. I. Nugraha, and F. I. Nurhadi, “Rockport walking fitness test apps: application of cardiorespiration fitness test with rockport method android based”, Medikora J. Ilmiah. Kes. Or., vol. 20, no. 1, pp. 23–35, Apr. 2021.