An exercise management system is disclosed for maintaining a user's level of exercise intensity (such as measured by heart rate) at a target level while exercising. In one embodiment, the system includes a movement member (such as pedals) which is engaged by the user to provide an exercise movement....http://www.google.com/patents/US5318487?utm_source=gb-gplus-sharePatent US5318487 - Exercise system and method for managing physiological intensity of exercise
