Using an irrelevant phrase to describe something is called a figure of speech, an expression, or an idiom.
That is called a non sequitur, which is a statement that does not logically follow the previous statement or context. In your example, the phrase "I rack up more mileage" is a non sequitur because it does not relate directly to the previous statement about walking.
Introducing irrelevant facts or arguments to distract from the subject under discussion is a type of logical fallacy called a red herring. This tactic is often employed to divert attention away from the main issue being debated in order to confuse or manipulate the audience.
Metaphor.
A toll is a payment for traveling on a certain road, called a toll road. If something has "taken its toll," it has somehow taken something out of you - not literal payment, but emotional and/or physical energy.
When you repeat something that has already been said, it is called "reiterating" or "restating."
The immediate repetition is is called an appositive, where new information is given about the noun.ExamplesThe teacher, once a dancer herself, was very skilled.My sister Eve is nine years old.
If an amendment is not related to the subject of the bill, it is referred to as a nongermane amendment. A synonym for nongermane is irrelevant.
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Castration. Something that I would hate to happen to me.
The feeling or mood you try to communicate when you describe something is called "tone." Tone is conveyed through the language, style, and attitude of the writing or speech.
The fallacy of irrelevant reason is sometimes called the red herring fallacy. It involves diverting attention away from the main issue by introducing an irrelevant argument or point.
Measurement information that is used to describe something is called data. per Physical Science 8th Edition by Bill W. Tillery
Entities are sometimes called gods because they they are often difficult to describe in anthropomorphic terms.
A rule that is proposed is called a hypothesis. Once it has been tested and verified it becomes a theory.
I am completely unfamiliar with anything called the "wall of Sauron"... and that's saying something.
An area of land smaller than a continent and completely surrounded by water is called an island. Islands can vary in size from small ones like Key West in Florida to large landmasses like Greenland.
Its called forsight not many people have it.
This concept is known as "relative position" or "spatial relationship." It helps describe the position of one object in relation to another or in a given context.