Dragon Ball: How Goku Learned the Kaio-ken Technique & Who Taught Him

In honor of one of Goku's coolest techniques, here's a look at how he acquired it and how he uses it throughout Dragon Ball Z and Dragon Ball Super.

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Dragon Ball: How Goku Learned the Kaio-ken Technique & Who Taught Him

Why doesn't Goku teach the Kaio-Ken technique to his human friends so they can keep up and have a better advantage against the increasingly stronger god-like enemies? Why doesn't he personally train