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 10 of 17 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 10 Mountain Climbers Start in a traditional push-up starting position — shoulders over hands and weight on just your toes. Bring your right foot forward, bending the knee and putting weight on the ball of your foot. Swiftly switch legs, bringing the left knee forward while moving the right leg back. It feels a little like running in place in a plank position. This counts as two reps. Previous Next Start Slideshow CrossFitWorkouts