Popsugar Health & Fitness Workouts Best Exercises For Strong Abs I'm a CrossFitter, and These Are the 20 Core-Carving Exercises I'm Obsessed With 28 November 2018 by Jenny Sugar View On One Page Photo 20 of 20 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 20 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 WorkoutsAb Exercises