Looking to join the Winter Arc or wondering what it is? Here's everything you need to know about the self-improvement challenge and how to get started. The great lock-in, also known as the winter arc , is currently trending on TikTok. Ahead, experts explain what it is and how to do it realistically. Show More ‘ Winter Arc ’ Meaning If you’re confused by what the point of the Winter Arc is, AKA the “Great Lock-in” of 2025, you’re not alone. The “ Winter Arc ” sounds like a way to describe character development in a book or TV show, but it’s been all over our social media feeds lately…so what does it mean? In a nutshell, the Winter Arc is a trend where people are setting highly rigorous personal goals for fitness, nutrition, self-care, or any aspect of their health and well-being. They work on these goals in an intense, consistent way—but only during the winter months. Basically, you’re starting your New Year’s ...

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