There are two opposite tactics here that can both work.

• Plan A: Increase your intensity – add intervals to your cardio or intense strength circuits two or three times a week. This shoves your brain and muscles out of cruise control, and your body will start burning stored calories to do the activity.
• Plan B: Take a day off. If you’re exercising too hard or too often, you may be overtraining, causing your body, which thinks it’s under attack, to shift into preservation mode and stockpile resources, especially fat.