Popsugar Fitness Workouts Cardio Ab Exercises Do Any of These 9 Moves to Blast Calories and Tone Your Abs at the Same Time June 6, 2017 by Dominique Michelle Astorino View On One Page Photo 6 of 9 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 6 Knee Driver Begin with your weight on your left foot and your hands together in front of you for balance. Bend your left knee and extend your right leg behind you, placing little to no weight in the right toes. Drive your right knee toward your chest, bringing your hands to meet your knee. Reextend your right leg behind you. This completes one rep. Continue for 30 seconds on this side, then switch sides. Previous Next Start Slideshow WorkoutsCardio WorkoutsCardioBodyweight ExercisesGIF ExercisesAb Exercises