Popsugar Health & Fitness 20-Minute Workouts 20-Minute CrossFit AMRAP Workout This 20-Minute CrossFit Workout Will Push You Hard and Make You Feel Alive! 16 April 2019 by Jenny Sugar View On One Page Photo 1 of 4 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 1 Box Jump Stand with your feet slightly wider than hips-width distance apart in front of a sturdy box that's six to 24 (or more!) inches tall. Bend your knees and swing your arms back. Jump onto the top of the box with both feet, swinging your arms forward to give you a little momentum. Step one foot at a time back to the floor, or jump down softly with both feet. This counts as one rep. Do 10 box jumps. Previous Next Start Slideshow 20-Minute WorkoutsIntermediate WorkoutsCrossFitWorkouts