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DAREBEE Workout: What it Works
Core Burn demands perfect form when performing High Knees, which means your knees need to come to waist height each time and you only ever land on the ball of the foot. You pump your arms in synch to your legs. The rest of the exercises are not easy either but then again you're here to make your core and abs feel they've worked out. This will do it. 
Extra Credit: 1 minute rest between sets.