Umam, Choirul, et al. “EFFECT OF EXERCISE BENCH PRESS AND SITTING CALF WITH CHEST PRESS AND LEG PRESS TO POWERARM MUSCLE AND POWER LIMB MUSCLES”. JIPES - JOURNAL OF INDONESIAN PHYSICAL EDUCATION AND SPORT, vol. 3, no. 2, Dec. 2017, pp. 57-69, doi:10.21009/JIPES.032.05.