This study was conducted to review the muscle activity of the supra-hyoid muscle and infra-hyoid muscle during Jaw Opening Agasinst Resistance Exercise and Chin-Tuck Against Resistance Exercise. The two exercises were applied to 48 adults living in City D. The surface electromyogram of the supra-hyoid muscle and infra-hyoid muscle were measured. The muscle activity of the the supra-hyoid muscle and infra-hyoid muscle in accordance with the exercises were compared using a corresponding sample t test. The study showed a statistically significant difference in the muscle activity of the supra-hyoid muscle (p<.01), while there was no such difference in the muscle activity of the infra-hyoid muscle (p=1.00). The findings show that both resistant lower Jaw Opening Agasinst Resistance Exercise and Chin-Tuck Against Resistance Exercise can lead to muscle activation in the supra-hyoid muscle and the infra-hyoid muscle. Jaw Opening Agasinst Resistance Exercise was found to encourage more muscle activation in the supra-hyoid muscle. While there was no statistcial difference in the muscle activation of the infra-hyoid muscle, the findings indicate that the two exercise can encourage similar muscle activation in the infra-hyoid muscle. A more clear theoretical basis can be provided if the the effects of the two exercises are compared in patients with muscular weaknesses in the supra-hyoid muslce and infra-hyoid muscle.