Background : Trunk stabilization exercises activate the stabilizing muscles of the trunk and essential for the correct function of the lumbo-pelvis. The bridge exercise increases the activity of the trunk stabilizing muscle, and is also used for the treatment of these muscles. Various studies related to sling exercise have been conducted, although none of them examined its effects on the muscle activity of trunk stabilizing muscles when the bridge exercise was performed by applying the sling neurac method. Objectives : The purpose of this study was to investigate which support surface the trunk and hamstring muscles high activity during bridge exercise using sling neurac method. Methods Seven teen healthy subjects, and the surface electromyography was attached to transverse abdominis, multifidi, and the dominant side hamstring muscles. Then, the maximum voluntary isometric contraction was measured. The bridge exercise was performed on either the floor, on a foam roller, and sling surface by randomly. A one-way repeated measures ANOVA was performed to determine the difference in muscle activity between the surfaces. Results : There was a significant difference in the activity of all muscles according to the difference in the supporting surface (p < 0.05). In the transverse abdominis, the sling surface showed significantly higher than the other support surfaces (p < 0.001). Conclusions : In this study, the more unstable the support surface, the highly muscle activity in all muscles. Especially, in the sling neurac method, a significant increase in the transverse abdominis muscle activity was observed compared to the other surfaces. These results suggest that exercise on a support surface applying the sling neurac method can simultaneously induce the contraction of the trunk stabilization muscles and hamstrings. Therefore, the bridge exercise using the sling neurac method proposed in this study is an effective way to strengthen the hamstring muscles while maintaining the stability of the trunk.