*Amplitude: high = 5 mm; low = 2.5 mm.

†Exercises: a, static position, standing with knees slightly bent, feet in the middle of platform and slightly apart, back straight; b, static position, one leg stance with knee slightly bent, foot in the middle of platform, back straight; c, static or dynamic position, mini squat; d, static or dynamic position, one leg mini squat; e, static or dynamic position, deep squat; f, static or dynamic position, one leg deep squat; g, static or dynamic position, wide stance squat; h, static or dynamic position, lunge, one foot in the middle of platform, back straight, bend the knee about 90°; i, static or dynamic position, toe standing.