Popsugar Fitness Workouts Plank Exercises For Abs For a Leaner Belly, These 35 Plank Variations Are a Must (Plus 1 Bonus Video!) August 15, 2018 by Jenny Sugar View On One Page Photo 15 of 37 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 15 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 your right foot back on the ground. Alternate sides, bringing your left knee in. This counts as one rep. Previous Next Start Slideshow WorkoutsPlankArm ExercisesAb Exercises