MET is one of the few physical therapy having its own criteria. Mr.Holten approached the Norwegian Health Authority in 1967 to get his MET System recognized as a treatment method of its own. He was granted his approval for his exercise system`s specific criteria connected with the treatment method. In MET, the patient exercises himself without manual participation by physiotherapists, however,under continuous supervision. The apparatus should be designed that functional quality (arthrogenous, circulatory, respiratory, neuromuscular)in question is optimally influenced when the patient carries out exercise in a certain range against a graded resistance. The therapy reassesses the scheme of treatment at least every tifth session and the maximum number of patients being 5 person per hour. The important principles in medical exercise Therapy arc stabilization of hyperfunction through the system of autostabilization and mobilization of hypofunction through automobilization. In MET, exercises are adjusted to the patient`s reactions. MET equipment is therefore made to meet requirements for treating patients with painful pathological dysfunction in the musculo-skeletal system.