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 7 of 17 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 7 Box Jumps Stand with your feet slightly wider than hips-width apart in front of a sturdy box. Bend your knees, and swing your arms back. Jump onto the top of the box with both feet at the same time, swinging your arms forward to give you a little momentum. Once you land, stand up until your legs are straight and drive your hips forward. Step one foot at a time back to the floor, or jump down softly with both feet. This counts as one rep. Previous Next Start Slideshow CrossFitWorkouts