| 摘要 |
<p>An exercise device for training abdominal muscles comprises a substantially flat lower side and an upper side opposite to the lower side. The upper side has a curved person-facing upper surface including a first sitting portion adjacent to a first back supporting portion having a steeper ascending inclination with respect to the lower side than the first sitting portion, as seen from the first sitting portion to the first back supporting portion, and at least a second sitting portion adjacent to a second back supporting portion having a steeper ascending inclination with respect to the lower side than the second sitting portion, as seen from the second sitting portion to the second back supporting portion. At least a part of the first sitting portion forms an edge portion of the device without having a further inclination or having an ascending inclination less steep than that of the first back supporting portion, as seen from the first back supporting portion to the first sitting portion. The first and second back supporting portions extend between the first and second sitting portions, and the inclination of the first back supporting portion is steeper than that of the second back supporting portion.</p> |
