If you play tennis, you’ll know it’s not the easiest game to master. There are a multitude of things to consider simultaneously: ball speed, bounce and spin, your position, your opponent’s position, footwork, swing, follow through, getting into position for the next shot.

Now imagine doing all that without seeing. That’s what Wei Lian, Wai Yee, Steady, Hock Bee, Ivni and their friends do.

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