Abstract: An exercise machine applicable for strengthening a user's abdominal muscles is described. The exercise machine can include a base frame to provide ground support, a mounting assembly rotably mounted over the base frame, a backrest assembly movably coupled to the mounting assembly via one or more pivot joints for swivel movements along the base frame and a handle assembly adjustably affixed to the backrest assembly to allow a user sitting on the seat pad to induce the swivel movements via the backrest assembly.

Abstract: An exercise machine applicable for strengthening a user's abdominal muscles is described. The exercise machine can include a base frame having a seat pad, a front leg and a rear leg. The seat pad can be elevated with the front leg and rear legs to provide round support. A mounting assembly may be rotably mounted on the base frame over the rear leg. The mounting assembly can have at least one pivot joint. A backrest assembly can be movably coupled to the mounting assembly via the at least one pivot joint for swivel movements along the base frame. The backrest assembly can a backrest pad and handle bars. The handle bars can allow a user resting against the backrest pad to control the swivel movements while sitting on the seat pad.

Abstract: An exercise machine applicable for strengthening a user's abdominal muscles is described. The exercise machine can include a base frame having a seat pad, a front leg and a rear leg to provide ground support. A mounting assembly a front pivot joint and a rear pivot joint may be rotably mounted on the base frame. A backrest assembly including a backrest pad, lever bars and backrest support bars can be pivotally coupled to the mounting assembly. The front ends of the backrest support bars can be pivotally coupled to the front pivot joint. The front ends of the level bars can be pivotally coupled to the rear pivot joint. The swivel movements can be controlled via a adjustable control mechanism including a height control adjustably attached to the mounting assembly to provide a stop height support of the backrest pad at the rear end of the backrest bars.

Abstract: An exercise machine applicable for strengthening users abdominal muscles is described. The machine can include a track frame including a pair of parallel rails to provide gliding support for movement along the parallel rails. Two sliding assembly may be movably mounted on the parallel rails respectively. Each sliding assembly may be configurable to move together or separately along the parallel rails. Two seat pads may be adjustably secured to the two sliding assembly respectively. Each seat pad may be rotationally adjustable to change angular relationship between the seat pad's longitudinal direction and movement direction along the parallel rails.

Abstract: An exerciser machine applicable for strengthening a user's muscles via wave like movements is described. The exerciser can include a base assembly a resilience member and a seat pan. The seat pan may be rotatably attached to the base assembly via the resilience member. The seat pan may have a seat protrusion movably attached to a top end of the resilience member. The base assembly may have a base protrusion to secure a bottom end of the resilience member. A separation distance between the seat protrusion and the base protrusion along an axis of the resilience member can allow the resilience member to distort along the separation distance to provide resilience force with movement of the seat pan. The resilience force can allow exercising a user's body via the movement of the seat pan.

Abstract: An exercise machine applicable for strengthening a user's abdominal muscles is described. The exercise machine can include a track frame having a higher end and a lower end. Kneeling assemblies may be mounted on parallel gliding rails of the track frame to receive the knees from a user to make movements up and down between the lower end and the higher end of the track frame. A rotationally adjustable armrest holder may be adjustable rotationally mounted on the upper end of the track frame. The armrest holder can be oriented towards a direction having an angular relationship with an axis of the track frame between the lower end and the higher end. The armrest holder may capable of supporting the arms of the user making the movements with a twisting effect according to the angular relationship.

Abstract: An exercise machine applicable for strengthening a user's abdominal muscles is described. The exercise machine can include a track frame having a higher end and a lower end. Kneeling assemblies may be mounted on parallel gliding rails of the track frame to receive the knees from a user to make movements up and down between the lower end and the higher end of the track frame. Each kneeling assembly may be engaged with a pair of the gliding rails. A rotationally adjustable armrest holder may be adjustable rotationally mounted on the upper end of the track frame. The armrest holder can be oriented towards a direction having an angular relationship with an axis of the track frame between the lower end and the higher end. The armrest holder may capable of supporting the arms of the user making the movements with a twisting effect according to the angular relationship.

Abstract: An exercise machine applicable for strengthening a user's abdomen muscles is described. The exercise machine applicable can include a swivel joint assembly having a collar post perpendicularly coupled with a transverse bar in a rotatable manner around the transverse bar, a base assembly, a seat assembly, handle bar assembly and a leg support assembly to allow a user seated on the seat assembly to cause movement of the seat assembly for muscle exercises. The leg support assembly may be detachably affixed to either the front base frame or the seat assembly to allow the seat assembly to move together with the leg support assembly or separately from the leg support assembly. The handle bars may be detachably affixed to either the seat assembly or the base assembly to allow the seat assembly to move together with the handle assembly or separately from the handle assembly.

Abstract: An exercise machine applicable for strengthening users abdominal muscles is described. The machine can include a track frame including a pair of parallel rails to provide gliding support for movement along the parallel rails. Two sliding assembly may be movably mounted on the parallel rails respectively. Each sliding assembly may be configurable to move together or separately along the parallel rails. Two seat pads may be adjustably secured to the two sliding assembly respectively. Each seat pad may be rotationally adjustable to change angular relationship between the seat pad's longitudinal direction and movement direction along the parallel rails.

Abstract: An exercise machine applicable for strengthening users abdominal muscles is described. The machine can include a track frame and a support frame adjustably coupled to the track frame. The track frame can include a pair of parallel rails to provide gliding support for movement along the parallel rails. Two sliding assembly may be movably mounted on the parallel rails respectively. Each sliding assembly may be configurable to move together or separately along the parallel rails. Two seat pads may be adjustably secured to the two sliding assembly respectively. Each seat pad may be rotationally adjustable to change angular relationship between the seat pad's longitudinal direction and movement direction along the parallel rails.

Abstract: An exercise machine applicable for strengthening users abdominal muscles is described. The machine can include a track frame and a support frame adjustably coupled to the track frame. The track frame can include parallel rails to provide gliding support for movement along the parallel rails. Two sliding assembly may be movably mounted on separate pairs of the parallel rails respectively. Each sliding assembly may be configurable to move together or separately along the parallel rails. Two seat pads may be adjustably secured to the two sliding assembly respectively. Each seat pad may be rotationally adjustable to change angular relationship between the seat pad's longitudinal direction and movement direction along the parallel rails.