Popsugar Health & Fitness Workouts Julie Ertz Diet and Exercise Routine Olympian Julie Ertz Shares How to Get Strong Legs and Abs Like a Professional Soccer Player 26 February 2019 by Tamara Pridgett View On One Page Photo 6 of 12 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 6 Elbow Plank With Side Step Start in an elbow plank and alternate stepping your legs to the side, keeping your toes off the floor. To modify, tap your toes to the floor. Previous Next Start Slideshow Core ExercisesLeg ExercisesStrength TrainingWorkoutsAb ExercisesSoccerPopsugar InterviewsWorld Cup