Operation 66 has joined the long line of viral fitness challenges promising to help you overhaul your health. Like the 75-Hard, 75-Soft, and Winter Arc challenges, Operation 66 is designed with ...

Viral online exercise challenges, like the 75 Hard or the 12-3-20, might get you in shape in the short run, but they may not help you build sustainable healthy habits. By Talya Minsberg A new trending ...