Abstract: A method of fatiguing a target muscle group of a user using an exercise device includes grasping in each hand one of a pair of outer handles of an exercise device, positioning the user's feet to be substantially aligned with the user's shoulders while maintaining the user's torso in a substantially upright orientation, positioning each hand in an initial position relative to the user's torso, cyclically pulling the outer handles away from one another in a cyclic motion to apply a cyclic pulling force to the tethers to cause the central disk to alternately rotate in opposing directions of rotation, and moving one or both hands to a secondary position relative to the user's torso and repeating the application of the cyclic force to fatigue the initial target muscle group or to fatigue a secondary target muscle group.

Abstract: An exercise device comprises a pair of outer handles and an inner, central disk, rotatable relative to the handles. The disk includes at least a pair of orifices formed therein or therethrough. At least one tether or cord extends between the handles and through the orifices in the central disk. Manipulation of the handles by a user results in cyclic spinning of the disk.

Abstract: An exercise device comprises a pair of outer handles and an inner, central disk, rotatable relative to the handles. The disk includes at least a pair of orifices formed therein or therethrough. At least one tether or cord extends between the handles and through the orifices in the central disk. Manipulation of the handles by a user results in cyclic spinning of the disk.