Abstract: An improved exercise apparatus comprising an elevated stand having at least one line guiding member lateral thereto, a line held by said line guiding member, said line having a device for body attachment at one end thereof with the other end being attached to a device for creating tension, the tension creating device having an anchoring device generally opposite the point of line attachment.

Abstract: A three-plane goniometer or angle measuring apparatus includes three small potentiometers which are closely spaced together to measure rotation of the knee about three different axes. The unit is primarily mounted on a cuff on the outside of the thigh. The mounting assembly for the three plane goniometer includes a curved yoke where the ends of the yoke curve from the front to the rear, with the goniometer unit being held between the ends of the rearwardly extending arms of the yoke, so that accurate measurement may be maintained in all three planes even while the knee is bent to its extreme flexed position. Extending downwardly from the goniometer is a square rod which slidably engages a square hole in a nylon ball mounted in a two-axis gimbal, which is secured to a cuff strapped to the calf of the leg.