Table 1. Strength training protocol. Weeks Exercise Intensity Set × repetition 1 Three-direction ankle strength Green band (Level 3) 3 × 10 Single-leg heel raise - 3 × 10 2 Three-direction ankle strength Green band (Level 3) 4 × 10 Single-leg heel raise - 3 × 10 3 Three-direction ankle strength Blue band (Level 4) 3 × 10 Single-leg heel raise - 3 × 20 4 Three-direction ankle strength Blue band (Level 4) 4 × 10 Single-leg heel raise - 3 × 20 5 Three-direction ankle strength Black band (Level 5) 3 × 10 Single-leg heel raise - 4 × 20 6 Three-direction ankle strength Black band (Level 5) 4 × 10 Single-leg heel raise - 4 × 20