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 12 of 12 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 12 Elbow Plank With Knee Drive Start in an elbow plank, and bring your right knee into your nose; your pelvis will rise toward the ceiling. Place right foot back on the ground. Alternate sides, and bring your left knee into your nose. Place right foot back on the ground. This counts as one rep. Previous Next Start Slideshow Core ExercisesLeg ExercisesStrength TrainingWorkoutsAb ExercisesSoccerPopsugar InterviewsWorld Cup