Abstract: A knee alignment device employing a plurality of sensors which are positioned about various areas of a user's knee. The sensors are coupled to circuitry including a microprocessor which has stored therein optimum values indicating correct knee motion during an exercise. These values are compared with the actual values being generated by a user in performing the same exercise, and if the actual values exceed those stored in the microprocessor, the user is warned of a dangerous condition which is indicative in informing him to modify the exercise being performed.