The invention discloses a strength assisting mechanism of fitness equipment, and relates to the technical field of fitness equipment, the strength assisting mechanism comprises a support frame, an assisting mechanism is fixedly mounted on the rear side of the top of the support frame, a sliding seat plate is slidably connected to the rear side of the inner surface of the support frame, and a sliding pedal is slidably connected to the front side of the inner surface of the support frame; and a foot fixer is fixedly mounted at the top of the sliding pedal. When a user sits up, the user can sit on the sliding seat plate, when the user lies down, a first
sponge mat on the supporting plate is squeezed, a rotating column can drive a
volute spiral spring to contract through a rotating rod, and therefore when the user sits up, the user can
sit up through the elastic force of the
volute spiral spring, and the user can
sit up conveniently. According to the sit-up training device, the rotating rod can provide pushing assistance for the back of a user through the supporting plate and the first
sponge mat, the user can conduct sit-up training more conveniently, the pushing position of the supporting plate can be limited through the limiting mechanism, and the sit-up training is more comfortable and efficient.