Running can quickly take over every aspect of your life, including the more personal parts.
You consider running shoes a perfectly acceptable shoe choice with jeans.
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They may not be the most fashionable footwear, but they're comfortable. Not to mention expensive enough to replace a few years' worth of standard tennies.
You regularly use running terms in everyday conversation.
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And then you're confused when non-runners don't understand what you're saying. You're not referring to an illegal drug when you talk about your LSD last weekend.
Your social media feeds are full of all things running.
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You might not be in on the latest celebrity gossip, but you do know what Meb is doing every day of his life—or at least, whatever he cares to share on Twitter.