Does "run" in the passage below mean "flee"?

He demanded I tell him where the horses were. I told him that while he was unconscious, the horses had broken out of the barn because somebody had forgotten to close the door. Klaas hit me and told me that was a lie, ridiculous. Ruth and Cheryl are never interested in running, he said. They’re the laziest horses in Molotschna.

This passase has been taken from a book. Does "running" in the underlined sentence mean that they are unlikely to flee, run away, or simply run? (The next sentence makes me think it's the latter.)

Thank you very much for your help!