New Year's resolutions are often too big, too ambitious or too long-term—which is why they fail. But that doesn't mean you shouldn't plan to make changes. Change happens best when goals can be met.
Instead of resolving to get fit starting January 1, kick off a 30-day challenge for a specific muscle group. Try 30 days of planking, a 60-day squat challenge or 90 days of arm workouts.