Originally posted by Requimatic:

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A good way to train your weapon skills up quickly is to just stay in the plains and raise tamed lox. When they are tamed they dont fight back. Just hack at a lox for a while on high stamina foods with a bronze sword.

Works for every weapon type. They have a large pool of health and when they are almost dead just feed them a piece of barley or cloud berry to regenerate their health and move onto the next lox and train on that one. They're the game's best punching bags.

Just be sure to turn off friendly fire and you'll be able to abuse them to your hearts content.