Exercise apparatus and method including a slidable handle assembly. In one embodiment, a support arm structure, pivotally mounted on an upright frame, enables alternatively fixed positioning of a rod at various vertical distances above a ground plane, in a generally horizontal orientation. A pair of left and right handle bracket assemblies are sildably mounted on the rod, and can be engaged by a user for moving the slidable handle bracket assembly across the rod while overcoming a resistance established by an adjustable resistance mechanism (e.g., weight stack). In one embodiment, the apparatus and method are used for developing muscles used during trunk rotation of a user in a standing position.