Popsugar Health & Fitness 15-Minute Workouts 15-Minute CrossFit Jump-Rope Arms and Legs Workout This 15-Minute CrossFit Workout Destroyed My Arms and Legs (in a Good Way!) 2 February 2020 by Jenny Sugar View On One Page Photo 1 of 3 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 1 Jump Rope Grab a regular or heavyweight jump rope and do 50 jumps (called single-unders) or 30 double-unders. Previous Next Start Slideshow 15-Minute WorkoutsIntermediate WorkoutsCrossFitWorkouts