Neutral zone in spinal stability plays a vital role in core stability .it has been proven that before initiation of any limb activity first transverses abdominis is electrically active and then peripheral concerned musculature acts. Difference in activation and cross-sectional area of trunk muscles have been demonstrated between LBP patients and healthy controls. As part of stabilization exercises bridging is a common exercises. Bridging has many variations and it becomes imperative that exercise which elicits maximum electrical activity may be therapeutically more suitable. . The supine posture with knees and hips bent used during bridging exercise is to most LBP patients a comfortable, pain-free posture. From this position more graded activities can be performed such as lifting the pelvis. In order to create more functional tasks, limb movements can be added. An unstable support surface cause body perturbation, leading to an increase in activity by the trunk muscles in an effort to maintain postural stability. An unstable surface is used during the bridging exercise; the co activation of trunk muscles may be enhanced to reduce body perturbation. Conclusion: Along with limited literature there is conflicting evidence as to the activation of core musculature with different bridging stabilization exercises.

Keywords: EMG; Core muscles; Bridging; Transversus abdominis; Multifdus; Unstable surface.