Abstract: An improved strength machine is at least partly distinguished by the following features: having a housing (20), a housing frame (141), an inner supporting structure (145) and/or an inner frame (145, 150), having a rotatable flywheel weight (13) mounted in the housing (20), on the housing frame (141), on the inner supporting structure (145) or on the inner frame (145, 150), the flywheel weight is fitted on a shaft (12) or is seated on a shaft (12), having a flexible pulling element (3), the flexible pulling element (3) is attached to the shaft (12) or a reel (95) which is mounted on a freewheel bearing (94), which is pretensioned by means of a spring arrangement (96) in the wind-up direction of the pulling element (3).