Popsugar Health & Fitness Crossfit Best CrossFit Ab Exercises These Are the 17 Best CrossFit Ab Exercises If You Want to Lean Out and Carve Your Core 5 August 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 CrossFitWorkouts