An abdominal exerciser which is characterized in that the moveable mechanism has a main shaft end portion mounted with a leg-hooking module and the top face of the end of the main shaft is a seat pad, and the two lateral walls of the main shaft corresponding to the middle section of the seat pad is extended with a hollow inner clutching member. The end face of the hollow clutching member corresponding to one lateral side of the leg-hooking module is extended with an extended engaging block. The interior of the inner clutching member is provided with a rod for pivotal mounting. The top portion of the two ends of the first supporting frame is formed into a first clutching member which corresponds to the rod. A twisting module is also formed in the abdominal exerciser to permit both rocking seesaw motion and twisting motion.
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