4. contraindications to CMT or mild-exertion exercise, as determined by the clinician through physical exam and x-rays (if indicated). Contraindications included but are not limited to: unstable or severe medical condition; severe osteoporosis, fracture or other osseous abnormalities; "high cardiovascular risk", ie.e. persons with known cardiovascular, pulmonary or metabolic disease, or one or more major signs/symptoms suggestive of cardiovascular and pulmonary disease