Popsugar Health & Fitness Intermediate Workouts 35-Minute CrossFit AMRAP Workout With Jumping Rope This 35-Minute CrossFit Workout Wasn't Gruelling Until After — I Was Sore For 3 Days! 14 December 2019 by Jenny Sugar View On One Page Photo 2 of 4 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 2 Dumbbell Box Step-Ups Stand in front of a box that allows your knee to be at about a 90-degree angle or larger when you place your foot squarely on it. Hold a dumbbell in each hand by your sides. Step your right foot onto the box, then your left, so both feet are on top of the box. Softly step the right foot back to the ground, then the left. This counts as one rep. Complete 75 box step-ups. Previous Next Start Slideshow Intermediate WorkoutsCrossFitFull-Body Workouts30-Minute WorkoutsStrength TrainingWorkouts