Popsugar Health & Fitness Workouts Workout For Abs Abs Are Built in the Kitchen, but This 15-Minute Workout Will Help You Get There Faster 2 August 2018 by Tamara Pridgett View On One Page Photo 1 of 11 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 1 Circuit 1, Exercise 1: High Knees Run in place while lifting your knees high to the level of your waist. Engage your abs as the knee comes up. Pump your arms to warm up your upper body. Complete 30 reps. Previous Next Start Slideshow Trainer TipsCore WorkoutsCore ExercisesAb WorkoutsStrength TrainingWorkoutsAb Exercises