An exercising machine comprising: a base frame having side members and a crossbar member to provide floor support, the side members including a first side member and a second side member, the crossbar member transversely coupled between the first and second side members; a backrest assembly rotablely coupled with the base frame; and a seat assembly having a seat pad, the backrest assembly having three or more axes of rotation and being configured to swivel with simultaneous rotational movements around the three or more axes of rotation, and at least one handle bar mounted substantially transverse to the axes of rotation, whereby the seat assembly is affixed to the crossbar member to allow a user sitting on the seat pad to cause the swiveling of the backrest assembly via hand pushes on the handle bars, characterized in that the backrest assembly comprising three or more pairs of pivot joints (115, 117, 119), at least two of the pairs of pivot joints (115, 117, 119) rotablely affixed to the side members, wherein each pair of pivot joints (115, 117, 119) defines one of the axes of rotation, the at least two of the pairs of pivot joints (115, 117, 119) include a first pair of pivot joints and a second pair of pivot joints, the backrest assembly further comprising: a first swivel structure having the first pair of pivot joints and a pair of swivel arms having the first pair of pivot joints, a third pair of the three or more pairs of pivot joints and a backrest bar rotablely coupled with the pair of swivel arms via the third pair of pivot joints, the first swivel structure rotable around the first axis defined by the first pair of the pivot joints; a second swivel structure having the second pair of pivot joints, the second swivel structure rotable around the second axis defined by the second pair of the pivot joints; and a backrest pad longitudinally coupled between the first swivel structure and the second swivel structure, wherein the backrest pad is affixed to the first swivel structure, wherein the backrest pad and the handle bars are affixed to the backrest bar and wherein the backrest bar is configured substantially in parallel with at least one of the axes of rotation, the backrest pad is movably attached to the second swivel structure, wherein the backrest pad moves according a swivel pattern during the swiveling of the backrest assembly, and wherein the second swivel structure is constrained to move longitudinally along the backrest pad to cause the swivel pattern in the movement of the backrest pad. a base frame having side members and a crossbar member to provide floor support, the side members including a first side member and a second side member, the crossbar member transversely coupled between the first and second side members; a backrest assembly rotablely coupled with the base frame; and a seat assembly having a seat pad, the backrest assembly having three or more axes of rotation and being configured to swivel with simultaneous rotational movements around the three or more axes of rotation, and at least one handle bar mounted substantially transverse to the axes of rotation, whereby the seat assembly is affixed to the crossbar member to allow a user sitting on the seat pad to cause the swiveling of the backrest assembly via hand pushes on the handle bars, characterized in that the backrest assembly comprising three or more pairs of pivot joints (115, 117, 119), at least two of the pairs of pivot joints (115, 117, 119) rotablely affixed to the side members, wherein each pair of pivot joints (115, 117, 119) defines one of the axes of rotation, the at least two of the pairs of pivot joints (115, 117, 119) include a first pair of pivot joints and a second pair of pivot joints, the backrest assembly further comprising: a first swivel structure having the first pair of pivot joints and a pair of swivel arms having the first pair of pivot joints, a third pair of the three or more pairs of pivot joints and a backrest bar rotablely coupled with the pair of swivel arms via the third pair of pivot joints, the first swivel structure rotable around the first axis defined by the first pair of the pivot joints; a second swivel structure having the second pair of pivot joints, the second swivel structure rotable around the second axis defined by the second pair of the pivot joints; and a backrest pad longitudinally coupled between the first swivel structure and the second swivel structure, wherein the backrest pad is affixed to the first swivel structure, wherein the backrest pad and the handle bars are affixed to the backrest bar and wherein the backrest bar is configured substantially in parallel with at least one of the axes of rotation, the backrest pad is movably attached to the second swivel structure, wherein the backrest pad moves according a swivel pattern during the swiveling of the backrest assembly, and wherein the second swivel structure is constrained to move longitudinally along the backrest pad to cause the swivel pattern in the movement of the backrest pad.