A device is described for supplementing muscle strength. The device comprises a flexible supporting structure configured to be worn on the body of a user during use of the device, and an actuator unit configured to apply a tensile force to a first tensile element of the flexible supporting structure in order to supplement muscle strength when a first body part is moved. The first tensile element extends to the actuator unit along a first path through a guide band of the flexible supporting structure, the actuator unit delimiting a section of the first path transversely to the longitudinal direction of the path. The first tensile element is further configured to be fastened to the first body part during use of the device.
