Aging populations has become a global issue. Fall is a prevalent concern among aging adults that can cause fracture, injury or mortality. Identifying the factors related to falls occurring within this aging population is essential for the development of effective regimes for fall prevention. Studies have shown that muscle quality and good posture alignments are critical for balance control in older adults. Older adults often combining with muscles weakness (sarcopenia), bone loss (osteoporosis) and lead to increased spine kyphosis causing vertebral fractures and poor balance control. Therefore, the long-term objectives of this work are to prevent fall in older adults by improving the function of degenerative muscles. The proposed research can provide needed information regarding the processes of balance control in this aging population, and can potentially be applied to individuals with poor balance who at high risk of fall. Three specific aims for this 3 years research project are described as follow: