The Effect of Sit Up Exercises on Abdominal Circumference Reduction of UPRI Sports Coaching Education Students. International Journal of Experimental Sports Science Research, [S. l.], v. 2, n. 1, p. 6–12, 2026. Disponível em: https://journalpejuang.web.id/index.php/ijss/article/view/109. Acesso em: 24 may. 2026.