40-Minute Sprinting and Walking Workout

Crunches not getting you the six-pack you want? You need heart-pumping cardio to burn calories and diminish your overall body fat, but more specifically, you need to do interval training, which is proven to target the fat around your belly. Here's a simple workout that alternates between pushing yourself to the max with one-minute sprinting intervals and recovering with two-minute walking intervals. Aside from trimming down that tummy, sprinting will also increase your endurance and speed, as well as tone your booty and legs.

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