Abdomen exercising and waist straightening machine

The utility model relates to an abdomen exercising and waist straightening machine, belonging to the technical field of exercises machines. The abdomen exercising and waist straightening machine comprises a chassis assembly and a backrest frame assembly, wherein a support external pipe of the backrest frame assembly is arranged at the middle of a chassis cross rod of the chassis assembly, a seat assembly is arranged between the support external pipe and a front segment of the chassis cross rod, a bent connecting element is arranged between the support external pipe and a rear segment of the chassis cross rod, and two sides of the bent connecting element are respectively provided with a return spring. Compared with the prior art, the abdomen exercising and waist straightening machine has the advantages of simple design and is convenient to use, and a body builder can exercise abdomen and straighten up waist due to the design of the bent connecting element.