An exercise device is disclosed that provides users with a way to effectively exercise their core muscles without going to a gym. The exercise device comprises a round tube, a pair of handles secured to the round tube, and at least one sphere inserted into the round tube, wherein a user rotates the exercise device in a circular motion causing the sphere to travel around the round tube. The round tube comprises an interior cavity with an internal track system for the spheres to travel. Typically, the spheres are weighted, and the exercise device comprises a plurality of spheres each of a different weight. Furthermore, the round tube can comprise an access panel positioned on the exterior surface of the round tube for inserting a sphere, and a pair of handles that span an inner diameter of the round tube and are secured to opposing sides of the round tube.