What's the difference between a pro and an amateur swing?

Everyone wants to have a simple swing, but it doesn't work. It's a backhand clear one-point lesson that's always hard. [Playlist]    • "That easy" 풀스윙 스페셜      • Academy 풀스윙🏸      • Principle [배드민턴, 생각과 원리]      • Basic 초보자 Beginners Badminton Lesson      • Angry 앵그리 한코치 시리즈 (풀스윙 ver. 매운맛)      • Good match 풀스윙 배드민턴🏸      • Defense 철벽수비 배드민턴!      • High class 🏸 자신있으면? '상급자 레슨'      • Doubles Rotation, Position 배드민턴 로테이션