Free Bullworker Wallchart – Isometric Exercise Training Planner What Is the Bullworker? The Bullworker is an exercise device that’s used for isometric exercise. It features spring-loaded, contracting cylinders and users push inward on both ends of the device to work the arm muscles. It has strap down the side which expand the workout to include … Continue reading Free Bullworker Wallchart – Isometric Exercise Training Planner