Cystic Fibrosis (CF) is the most common chronic hereditary disease in Caucasians. Due to improved therapy and better understanding of the disease, life expectancy has risen to an average of 38 years and is continuing to rise. With the increased life-expectancy it becomes even more important to maintain functional activity as part of quality of life. Mechanical stimulation in form of whole body vibration (WBV) is a new type of exercise currently tested in sports, geriatrics and rehabilitation. It has recently been found to be a safe and efficient method to activate muscular activity via stretch reflexes leading to improvement of muscular performance, body balance and physical functioning.