Abstract: An exercise device provides a programmable resistance over a range of body movements designed specifically for the type of body movement, with provisions for changing the program to other types of body movement and for adjusting the range of resistance for the program type to match variations in strength for different individuals. Preferably, the resistance is provided by permanent magnet coupling, and the magnetic flux coupling is changed, to correspondingly change the resistance, by moving the permanent magnets relative to magnetic material by means of a cam to establish a fixed program of resistance versus angular movement and further changed by adjusting the relative position between the permanent magnets and the magnetic material to change the range of resistance to the same program. Provision is made to return the coupling to an initial start position at the termination of the movement.