Abstract: An exercising device is provided for use with a baby stroller of the type having a housing secured to the frame of a stroller, and an elongated arm pivotally attached at one end of the arm to the housing. The invention may further include an apparatus for preventing pivotal movement of the arm relative to the housing until a torsional force greater than a predetermined amount is applied to the other end of the arm. The housing is secured to the stroller frame by a pair of plates, each having a channel in one side. With the channels facing each other, the plates compressingly engage a portion of the stroller frame. The elongated arm is pivotally attached to the housing by a fixed cuff interposed within a movable cuff. The movable cuff further includes a driven member including an aperture through which the elongated arm is attached.