Mei-Shun has felt something weird in her right knee from last week. Ah, her 6-day-a-week practice before stage performance had been too hard, it seemed. Her mother also has a trouble in knees, yet it simply caused by aging. She advised her daughter to see a doctor first. After making sure of no disease, she recommended a muscle training to reduce burden on knees. Yes, mom. Respectfully persuasive suggestion.