How to raise athletics skill past 5?

I know that swimming will raise the skill, but takes quite awhile. Practicing will only bring it up to 5. Working out or sprinting around doesn’t raise the skill at all. Is there a more efficient way to raise the skill, such as swimming with a backpack full of rocks or pedaling a bicycle?

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Swimming will raise the skill up to 10. I don’t know of any other way to increase past five, though.

I’m not sure about efficiency, but getting training from npcs can help.

Good idea, I do have NPC spawns maxed out in my world.