Popsugar Fitness Workouts Best Arm Exercises If Today Is Arm Day, Here Are 59 of the Most Effective Moves You Can Do June 21, 2018 by Jenny Sugar View On One Page Photo 44 of 59 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 44 Plank With Creepy Crawler In a plank position, bring your left knee to your left elbow. Then return the left leg back to the plank position. Repeat this action on the right side to complete one rep. Previous Next Start Slideshow WorkoutsStrength TrainingArm Exercises