If you're trying to learn a topspin serve, also note the toss in the video. He's tossing the ball behind his head instead of straight up, which will force you to hit left-to-right across the ball (for a right-hander). Tossing the ball slightly behind you will also force you to arch your back and swing up through the ball.
For me, the keys to a good topspin serve are the grip and the toss... then everything else sorta falls into place.
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