At the beginner level, tennis is a very technical sport, but at the high performance level, technicals take a bit of a back seat, and movement leads the way.
High performance tennis is considered to be one of the toughest sports in the world, due to the level of physical and mental fitness required. Unfortunately, too many people focus on the technical side of the game, as opposed to the physical.
You can work on your technique all you want, but if you can't get to the right position, with the right footwork, and have the appropriate strength to accelerate, you'll have trouble succeeding.

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