Popsugar Fitness Workouts What Are the Best Arm Exercises? Arm Day Will Leave You Sore as Hell If You Include These 25 Moves June 23, 2018 by Jenny Sugar View On One Page Photo 9 of 25 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 9 Up-Down Plank Begin in a full plank. Lower your right elbow to the mat and then your left, coming into an elbow plank. Put your right hand on the mat, and straighten your right elbow. Do the same on the left to return to a full plank. Previous Next Start Slideshow WorkoutsStrength TrainingArm Exercises