Dwi, Dicky Reva Apriana Sanga, et al. “VO2MAX ANALYSIS ABC RUNNING DRILL WITH TRAINING MASK METHOD USING ANDROID BASED”. Gladi : Jurnal Ilmu Keolahragaan, vol. 12, no. 05, Dec. 2021, pp. 396-02, doi:10.21009/GJIK.125.06.