Exercise machine provided with means to enable a user thereof to assume interchangeably a seated position and an inverted position

An exercise machine comprising:

• a base rested on a floor surface;
• a seat mounted on one end of said base;
• a backrest extending from said seat;
• a leg-exercising mechanism mounted on an opposite end of said base such that said leg-exercising mechanism is opposite to said seat, said leg-exercising mechanism comprising two crank arms, a damping device, and two pedals fastened to said two crank arms;
• and
• two hand grips connected to said two crank arms by an elastic pull cord;
• wherein said seat and said backrest are comprised of two rocking frames, each frame comprising a curved rod with a top segment, a straight bottom segment, an arcuate segment extending from said straight bottom segment, and a straight support segment located between said top segment and said arcuate segment, said top segment being fastened to an outer side of said backrest, said straight bottom segment being fastened to an underside of said seat, said arcuate segment having a radian corresponding to one fourth of a circular radian whereby said arcuate segment is capable of a rocking act to cause said backrest to rest on the floor surface by said straight support segment at such time when an inner side of said backrest is exerted on by a force of a person seated on said seat, said arcuate segment further being capable of the rocking act to cause said seat to rest on the floor surface by said straight bottom segment at such time when said seat is exerted on by a force of the person seated on said seat.