Abstract: A cam arm apparatus for exercise training and monitoring devices having a base plate secured to a pair of angle plates. A cam is operably secured to the base plate and a cam follower arm which is pivotally linked to a shaft element operably secured to an adjustment knob. An arm element may be secured to the cam for holding and positioning a ball, weight, or other training, sport, or exercise devices. A spindle shaft is linked to the cam and mounted on the angle plates so that the arm element is automatically returned to an initial starting point regardless of the angular positioning of the base plate or the amount of movement of the arm element around the cam, thereby allowing the return of the arm element against gravity to said initial starting point even if the base plate is angularly positioned.