A gym machine, comprising: a ground resting base, a structure for supporting a user which is associated to said resting base so that it can rotate about a rotation axis, at least one maneuvering body which is associated movably with said supporting structure; flexible elements which are stretched between said maneuvering body and said ground resting base; means for adjusting the coupling point (9,10) of said flexible elements to at least one between said ground resting base and said maneuvering body, so as to modify the load; said supporting structure rotating about said rotation axis between a first configuration and a second configuration when a user supported by said structure moves said maneuvering body, applying to said maneuvering body an action which is opposite with respect to the action applied thereto by said flexible elements, said at least one maneuvering body rotating or sliding with respect to the supporting structure and rotating together with the supporting structure with respect to said first axis, wherein said flexible elements comprise cable means which are wound around one or more pulleys which are associated with said supporting structure and/or with said maneuvering body and have an end which is associated in a respective coupling point with said maneuvering body and the opposite end which is associated in a respective coupling point with said ground resting base, characterised in that: said means for adjusting said coupling point are associated with said resting base and comprise a slider which defines said point for coupling said flexible elements to said resting base and is guided so that it can move along a path which is formed within said resting base and further comprising means for maneuvering said slider along said path, said maneuvering means being of a mechanical, electrical, electromechanical, hydraulic or pneumatic type, said maneuvering means comprise a screw which is supported so that it can rotate by said resting base and is coupled to a female thread which is formed in said slider, wherein manual, electrical, electromechanical, pneumatic or hydraulic elements for actuating the rotation of said screw are provided. a ground resting base, a structure for supporting a user which is associated to said resting base so that it can rotate about a rotation axis, at least one maneuvering body which is associated movably with said supporting structure; flexible elements which are stretched between said maneuvering body and said ground resting base; means for adjusting the coupling point (9,10) of said flexible elements to at least one between said ground resting base and said maneuvering body, so as to modify the load; said supporting structure rotating about said rotation axis between a first configuration and a second configuration when a user supported by said structure moves said maneuvering body, applying to said maneuvering body an action which is opposite with respect to the action applied thereto by said flexible elements, said at least one maneuvering body rotating or sliding with respect to the supporting structure and rotating together with the supporting structure with respect to said first axis, wherein said flexible elements comprise cable means which are wound around one or more pulleys which are associated with said supporting structure and/or with said maneuvering body and have an end which is associated in a respective coupling point with said maneuvering body and the opposite end which is associated in a respective coupling point with said ground resting base, characterised in that: said means for adjusting said coupling point are associated with said resting base and comprise a slider which defines said point for coupling said flexible elements to said resting base and is guided so that it can move along a path which is formed within said resting base and further comprising means for maneuvering said slider along said path, said maneuvering means being of a mechanical, electrical, electromechanical, hydraulic or pneumatic type, said maneuvering means comprise a screw which is supported so that it can rotate by said resting base and is coupled to a female thread which is formed in said slider, wherein manual, electrical, electromechanical, pneumatic or hydraulic elements for actuating the rotation of said screw are provided.