A method of performing a squatting exercise by an exerciser wearing a weighted vest, the vest has front and back portions and a panel member attached to the back portion of the vest, the panel member having one or more rows of roller-receiving cavities and a roller in each cavity for added weight. The printhead comprises a plurality of first nozzles and a plurality of second nozzles supplied with a same colored ink. A plurality of printhead segment carriers is received and secured in neighboring arrangement within the slot, and at least one printhead segment is mounted to each printhead segment carrier. The base band processor is connected to the telephone device, and the phone control program controls operation of the telephone device. The instruments provide a low profile engagement with the implants and facilitate insertion while minimizing tissue retraction and exposure of the tissue and neural elements to the instrumentation in the approach to the disc space. The concave inner of the cushion provides for comfortable fit to the top of the foot.