| 摘要 |
The present invention provides an improved sit-up exercise machine that can be used in sitting posture and functions to exercise several parts of belly, which comprises a sit-up chair and an underlay pivotally connected to the front of the sit-up chair. The chair consists of a back-support, a holding rod, and an adjustable axle seat. The adjustable axle seat is disposed on both sides of the chair, pivotally connects the back-support and the holding rod front and rear by pivot connection element on the top surface of the seat and adjusts the angle between the back-support and the holding rod in the range of several sections. Therefore, it can realize body-building and exercise of different parts of belly.
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