A significant decrease in physical performance is observed in MS patients. The reasons for this can be changes in muscle contractile structures and symptoms such as sarcopenia. Sarcopenia is a disorder characterized by loss of skeletal muscle mass and decrease in muscle strength and physical performance. Loss of muscle mass seen outside of old age is defined as secondary sarcopenia. In recent years, studies on neurological disorders and their relationship with sarcopenia have increased. Early diagnosis of sarcopenia in neurological patients and implementation of applications aimed at this are important from an early stage. The aim of this study is to examine the effect of exercise training in sarcopenic MS patients. In the study, participants will be applied a combined exercise program 3 days a week for 8 weeks. Parameters such as muscle thickness, balance, and fall risk will be evaluated before and after physiotherapy application including aerobic exercise, balance exercises, and strengthening exercises.