Sit-Up Pad for effective training of the abdominal muscles. Phantom Sit-Up Pads are placed under the back during traditional sit-ups and crunches. Due to the anatomical shape, your entire spine is always supported, which protects it and reduces back pain during training. In addition, you can train your abdominal muscles more efficiently, since the curvature causes a slight overstretching. The "Sit-Up Pad +" has an additional fold-out mat. This can serve as a base for the buttocks. When folded, it elevates the sit-up pad, providing more hyperextension and stretching.