sentence: A man starts serving tennis balls indoors and the title appears. sentence:  The man man keeps serving and the #3 tips slides across the screen. sentence:  The man swings the racket before serving. sentence:  The man looks at the ground behind him before serving the ball. sentence:  The camera angle changes and we move to tip #4. sentence:  The man swings the racket without serving. sentence:  The man stretches his arm out. sentence:  The man backs up and moves the racket. sentence:  We see tip #3 again. sentence:  We see the ending title card.