Fig. 2. Progressive balance training program with whole body vibration, A-1: weight bearing to anterior, A-2: weight bearing to posterior, A-3: weight bearing to left, A-4: weight bearing to right, B-1: calf raise, B-2: tiptop raise, B-3: tandem standing, B-4: semi-squat at 45 degrees, C-1: lift one leg forward at 30 degrees, C-2: lift one leg backward at 30 degrees, C-3: lift one leg sideward at 30 degrees, C-4: semi-squat at 60 degrees, D-1: lift one leg forward at 45 degrees, D-2: lift one leg backward at 45 degrees, D-3: lift one leg sideward at 45 degrees, D-4: squat at 90 degrees.