A core muscle exercising and resistance training device includes a weighted bar having opposed bar ends adapted to removably mount at least one weight or other force generating element. A pad element is removably and frictionally mounted on the bar, the pad element being constructed from a lightweight foam material having a density within a specific range. The pad has an outer surface with a radius of curvature substantially the same as a normal cervical curvature. In use, the outer pad surface is placed adjacent a user's cervical curve and the weighted bar, the additional isometric resistance generating elements and the pad element act in combination to apply a force upon the user's core cervical curve muscles for improving the user's cervical curve posture by gradually modifying the cervical curvature to conform with clinically desirable curvature.