Popsugar Fitness Workouts Best CrossFit Ab Exercises These Are the 17 Best CrossFit Ab Exercises If You Want to Lean Out and Carve Your Core August 5, 2019 by Jenny Sugar View On One Page Photo 4 of 17 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 4 V-Up Lie on your back, with your legs and arms extended a few inches above the floor. Lift your upper back off the floor, reaching your hands toward your feet with straight legs, creating a V shape with your body. Lower your arms and legs back down to starting position. This completes one rep. Previous Next Start Slideshow WorkoutsCrossFit