Patent ID: 7833143

Claim:
A sit-up exerciser comprising a base; a seat securely mounted on the base; a linkage assembly mounted between the base and the seat and having a handle arm rotatably mounted on the base adjacent to a front end of the base and having a pivot defined adjacent to a middle of the handle arm and connected to the base; a back arm rotatably mounted on the seat adjacent to a rear end of the base and having a pivot defined adjacent to a middle of the back arm and connected to the base; a massage roller device mounted on the back arm and having a mounting bracket rotatably mounted on an upper end of the back arm; and multiple rollers rotatably mounted on the mounting bracket; and a linking rod having two ends respectively connected pivotally to lower ends of the handle and back arms; at least one rear resilient element connected between the linkage assembly and the rear end of the base; a footrest assembly pivotally mounted on the base and protruding toward the front end of the base; and at least one front resilient element connected between the footrest assembly and the base.