“The Great Lock-In” is here, and if you’re thinking youth group sleepovers or overnight school field trips at a museum, then this explainer is for you. This lock-in — also known as the “winter arc challenge” — is a potentially concerning TikTok trend that could be another iteration of “skinnytok” or “looksmaxxing.”

Let’s start at the beginning. In its simplest form, “lock-in” is teen slang for being intensely focused on something. You can lock-in on anything, from homework to cleaning to hobbies and everything in between.

With that in mind, “the Great Lock-In” is a challenge or movement going viral on TikTok, where teens and other Gen Zers are encouraging everyone to “lock-in” on their health and fitness right now.

According to The Everygirl, teens are participating in this challenge du

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