The 15-minute HIIT workout to target abs - Muscle & Fitness

You can’t get a six-pack quickly, but you can work your way toward one with fairly short workouts—if you put in the effort. That’s where high-intensity interval training can come into play. By alternating intense isometric work (in the form of planks), targeted bending and twisting actions, and high-energy core cardio (mountain climbers), you’ll tax…

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