Abstract: An exercise machine to stretch one or more muscle groups or joints of a body part, has at least one engagement member pivotally mounted on the frame to engage a body part associated with the muscle group or joint that is to be stretched and to position such part at a desired location. The engagement member is pivotally displaceable through a predetermined range of movement with respect to the frame. Movement in a first direction is effective to apply a stretching force to the associated muscle group. Movement of the engagement member in the first direction is done through a linear actuator. An angle indicator provides a readout of the position of said engagement member in the range. At any selected position in the range the engagement member can be blocked against movement in a direction opposite to the first direction and the force exerted by said body part upon the engagement member in the second direction is measured.