Obesity is a global health concern, it is cause of many co–morbidities (such as osteoarthritis OA, cardiovascular disease, diabetes, hypertension, hypercholesterolaemia, etc.) that pose serious health problems, decrease quality of the life, and increase healthcare system costs. In particular, obesity is a modifiable risk factor for knee osteoarthritis (OA), because the excess body mass modifies lower extremity joint loads during locomotion [1]. So, the additional weight is responsible for potentially unhealthy joint loads in obese individuals. This condition can bring serious disability to perform activities of daily living and the risk of knee OA increase with increasing of BMI. Weight loss is critical to reducing incidence of OA and decrease the risk and/or severity of such diseases [1, 2].