Popsugar Fitness Fitness Tips Ab and Butt Exercises These 5 Simple Moves Combine Cardio, Core, and Booty Work December 6, 2017 by Dominique Michelle Astorino View On One Page Photo 3 of 5 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 3 Knees and Toes The lower abs are a little tougher to work, but this move totally burns 'em . . . all while you get a good leg workout, too! How to do knees and toes. Previous Next Start Slideshow Fitness TipsWorkoutsGIFButt ExercisesCore ExercisesGIF ExercisesAb ExercisesLeg Exercises