FitnessMental HealthNutritionThe Annual Winter Arc Has Been Rebranded - Welcome to the Great Lock-InBy Chandler PlanteUpdated on Sep 3, 2025 at 3:25 PMGetty | The Good BrigadeGetty | The Good BrigadeIf you're looking to enter 2026 feeling like the best version of yourself, TikTok's "The Great Lock-In" - also known as the winter arc least season - may be the exact trend you've been looking for. "It's all programming your mind to go hard for a sprint of time. A sprint. It's not meant to be forever," explains creator Tatiana Forbes in a TikTok with over 800,000 views.