Popsugar Health & Fitness Workouts Low-Impact Cardio Workout This Cardio and Ab Workout Is Low-Impact and Intense, and It Will Get You Into Shape 23 February 2019 by Tamara Pridgett View On One Page Photo 5 of 6 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 5 High Knees Run in place while lifting your knees high to the level of your waist. Engage your abs as your knee comes up. Pump your arms to warm up your upper body. Each time your foot makes contact with the ground, that counts as one repetition. Beginners should complete 20 reps, and intermediate/advanced levels should complete 30 reps. Previous Next Start Slideshow Trainer TipsIntermediate WorkoutsCore Exercises30-Minute WorkoutsCardio WorkoutsWorkouts