Abstract: An abdominal exerciser has a base (10), a pulling frame (20), seat assembly (30), a step device (40) and multiple actuating linkages. The pulling frame (20), the seat assembly (30) and the step device (40) are pivotally connected to the base (10) and to each other by the multiple actuating linkages. Thereby, the abdominal the step device (40) and the seat assembly (30) are pivoted toward the pulling frame (20) by the actuating linkage when the pulling frame (20) is pulled down to cause a person to bend to exercise and tone the abdominal muscles.