A device of an exercise apparatus, wherein the exercise apparatus includes a loading interface and a frame coupled to the loading interface for performing an exercise, the device characterized by: a linear adjustment system that is configured to fix the loading interface of the exercise apparatus at an initial position, wherein the initial position is a position at any one of a plurality of functional positions in a functional range of the loading interface, wherein the functional range includes a first terminal functional position, one or more intermediate positions, and a second terminal functional position, wherein, the linear adjustment system comprises a first end and a second end, and the first end is configured to be fixedly connected to one of the loading interface and the frame of the exercise apparatus; a correlation mechanism; and a sensor comprising a first side fixedly coupled to the second end of the linear adjustment system and a second side configured to be fixedly connected to the other of the loading interface and the frame, wherein the sensor measures a force exerted on the linear adjustment system, and the sensor outputs a signal in accordance with the force exerted on the linear adjustment system, wherein, the correlation mechanism correlates the measured force on the linear adjustment system to an actual force exerted on the loading interface from the exercise, in use the device enables a subject to exercise a muscle group in a range of motion, the range of motion includes a first subrange having a first maximum force that can be exerted by the subject, the range of motion further includes a second subrange having a second maximum force that can be exerted by the subject, the second maximum force is greater than the first maximum force, the initial position of the loading interface permits the subject to exert a force on the loading interface with the muscle group at a point in the range of motion that is in the second subrange without any requirement of passing through the first subrange, and the loading interface is further from the first terminal functional position throughout the entire second subrange than it is throughout the entire first subrange. a linear adjustment system that is configured to fix the loading interface of the exercise apparatus at an initial position, wherein the initial position is a position at any one of a plurality of functional positions in a functional range of the loading interface, wherein the functional range includes a first terminal functional position, one or more intermediate positions, and a second terminal functional position, wherein, the linear adjustment system comprises a first end and a second end, and the first end is configured to be fixedly connected to one of the loading interface and the frame of the exercise apparatus; a correlation mechanism; and a sensor comprising a first side fixedly coupled to the second end of the linear adjustment system and a second side configured to be fixedly connected to the other of the loading interface and the frame, wherein the sensor measures a force exerted on the linear adjustment system, and the sensor outputs a signal in accordance with the force exerted on the linear adjustment system, wherein, the correlation mechanism correlates the measured force on the linear adjustment system to an actual force exerted on the loading interface from the exercise, in use the device enables a subject to exercise a muscle group in a range of motion, the range of motion includes a first subrange having a first maximum force that can be exerted by the subject, the range of motion further includes a second subrange having a second maximum force that can be exerted by the subject, the second maximum force is greater than the first maximum force, the initial position of the loading interface permits the subject to exert a force on the loading interface with the muscle group at a point in the range of motion that is in the second subrange without any requirement of passing through the first subrange, and the loading interface is further from the first terminal functional position throughout the entire second subrange than it is throughout the entire first subrange.