Inclusion Criteria:  independent ambulatory diagnosed with low bone mass  Exclusion Criteria:  uncontrolled hypertension secondary osteoporosis fragility fracture, clinical or laboratory evidence of hepatic renal disease, uncontrolled disorders of the parathyroid thyroid glands, a history of cancer in the past 5 years, any structured resistance training within the previous year, and past therapy with any drug for osteoporosis, any current therapy for osteoporosis except zoledronic acid, inability to walk independently or any other medical conditions which could restrict the potential participants from full participation as decided by their physician.