If you’re looking for a fat-burning workout routine, zone 2 cardio delivers big returns.

Cardio workouts are organized into five categories or "zones" that vary in intensity based on your heart rate. Zone 2 is all about moderate-intensity exercise that puts your heart rate between 60 and 70% of its maximum capacity. This is exactly what you want to target if your goal is a trimmer physique, experts say.

Here’s how it works: While some, more intense workouts, burn other stores, including carbs, for fuel, exercising within the zone 2 range is precisely where you need to be in order to burn fat, Katherine Sickler , personal trainer and certified strength and conditioning specialist, previously told TODAY.com . While you might opt for a brisk walk, a popular way to get into zone 2, you c

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