The timed up-and-go test is a measurement of mobility. It includes a number of tasks such as standing from a seating position, walking, turning, stopping, and sitting down. For the test, the person is asked to stand up from a standard chair and walk a distance of approximately 3 meters, turn around and walk back to the chair and sit down again. The 10 meter walk test is a test of walking speed. Timed up-to-go test and 10 meter walk test will be assessed by certified physical therapist or trained research staff, and will take approximate 30 minutes including set-up time.