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Ma Long practices his table tennis backhand topspin against backspin of a chopper. This training session is not normal because backhand loop the underspin ball is not the strength of Ma Long. Don't use the backhand to attack this type of shot. Use your forehand instead.
The forehand training of Ma Long: https://www.youtube.com/watch?v=GqLJNNU7ZfE
Read more at: https://pingsunday.com/backhand-loop-technique-ma-long/
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