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I don't get it. King Kai said he was no match against Nappa and Vegeta, but in Dragon Ball Super Goku is very eager to train with him despite King Kai having nothing else for him to learn.
In King's Kai planet, he can train under 10 times gravity, plus King Kai can magically add weights of several tons to him like he did when he was training with him after being killed by Cell.
King Kai can also make big weight rings appear and many stuff like that
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