If you think lunges only hammer your lower body, behold the goblet reverse lunge. Named for the way in which you hold the weight -- vertically in front of your chest, which your hands cupped around the top -- this lunge variation can work the muscles of your core harder than many abs exercises do.

The reason: "Your core must work overtime to stay upright and stable as the weight tries to pull your chest forward," says Tony Gentilcore, C.S.C.S., C.P.T., and creator of ABS 360. With so many muscles working at once, you'll burn more fat and build more muscle in less time. (Build a better performing body and a sculpted core with The Toughest Exercise You Aren't Doing (but Should)).

Ready to try it? Watch the video below to learn how to perform the goblet reverse lunge with perfect form.

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