Popsugar Health & Fitness Workouts Workout For Abs and Butt Fire Up Your Abs and Bum With This 30-Minute Circuit 23 June 2018 by Tamara Pridgett View On One Page Photo 5 of 8 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 5 Side Plank Crunch Begin in a side elbow plank with your left forearm on the floor and your right hand behind your head. Keeping your torso stable and your waist lifted, bring your right knee up toward your shoulder to lightly tap your right elbow. Lengthen your right leg back to the starting position to complete one rep. Do eight reps on each side. Previous Next Start Slideshow Bodyweight ExercisesButt WorkoutsBodyweight WorkoutsIntermediate WorkoutsAb Workouts30-Minute WorkoutsButt ExercisesStrength TrainingWorkoutsAb Exercises