When standing for long periods (i.e. at a drafting table, ironing board, cooking, washing dishes, etc.), utilize a two to three inch platform as a foot stool. Rest one foot at a time on the platform so that with leaning forward, the muscles of the thigh carry the weight of the body, instead of the lower back. Periodically change the leading foot to avoid fatigue.
Another trick is to stand on a balance disc while at your activity, or use the balance disc as part of the platform for the leading foot. This uses the stimulus of balancing to train the sensory-motor reflex which improves stabilization of the core trunk structures