10 ELECTRONIC ERGOMETERS, WRIST WORN HEART-RATE COMPUTERS, CARDIOVASCULAR EXERCISERS, HEART MONITORS, FITNESS LEVEL METERS, PULSE METERS, ELECTRONIC THERMOMETERS, SPEROMETERS, ACTIVITY METERS, AEROBITRONICS, GONIOMETERS, SCOLIOMETERS, TENSION METERS, ANATOMICAL MODELS AND FEEDBACK SYSTEMS