Popsugar Health & Fitness Bodyweight Exercises Best Bodyweight Core Exercises Your 6-Pack Is Coming, and These Bodyweight Moves Will Make It Happen 13 December 2018 by Jenny Sugar View On One Page Photo 36 of 43 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 36 Runner's Crunch Start on your back with your elbows resting on the floor at a 90-degree angle. With your core engaged, roll up to almost sitting while bringing your right knee up to meet your left elbow. It should feel a little like running. With control, straighten your leg as you slowly lean your back down, vertebra by vertebra, until your shoulders touch the mat last. Alternate with your other leg to complete one rep. Previous Next Start Slideshow Bodyweight ExercisesStrength TrainingWorkoutsAb Exercises