To test the changes in osteoarthritis according to the X-rays, and changes in bone quality before and 1 or more years after beginning the jogging

Patients in this research are given an entry Bone Densitometry（DEXA）scan and are required to advance from 3-minute jogging a day to 10-minute level in daily practice for 1 year as instructed. After 1 year, subsequent DEXA scans are recorded. Interested participants are also encouraged to have hip and spine X-rays, and bone quality studies on study entry and two years later. Actual subject participation, intercurrent illnesses, fractures and changes in medication are self-monitored. Results are calculated by change in bone mineral density in the lumbar spine, hips and femurs by the DEXA scan in the study. Dose-response relationships between the amount of jogging and bone mineral density are sought. Jogging-related fractures and other adverse effects are also noted.

Inclusion Criteria:

Past DEXA scan and, all within 6 months of study entry, DEXA scan and normal values for: Metabolic panel, TSH, PTH, ESR (or CRP), Vitamin D 25 hydroxy, Vitamin D 1,25 dihydroxy, Urine NTX

Exclusion Criteria:

Known metabolic bone disease such as osteogenesis imperfecta, current treatment with steroids, chemotherapy, or currently healing fractures of lumbar spine, hips or femurs, severe heart disease