By mid-January, the excitement of the New Year has usually worn off. The motivation that felt so strong a couple of weeks ago is often replaced by packed schedules, unfinished to-do lists, and cold, gray mornings that make everything feel a little heavier. If you’ve already noticed some guilt creeping in—maybe about skipped workouts or goals that didn’t quite stick—you’re definitely not alone. Before turning that frustration inward, it can help to pause and consider what’s really going on: is...