Many forms of cardio tend to favor certain muscle groups over others, but not jumping rope.
Upper Body: Your arms are constantly working to move the jump rope which engages your shoulders, back, forearms, biceps and triceps. And if you use a heavier rope, your upper body will get even more of a workout because it is like adding weight training to your jumping.
Core: The balance required for jumping rope draws on your core muscles each time you jump and land. Abdominal, lower back and hip muscles are all used as they help stabilize and coordinate your movement.
Lower Body: Calf muscles are heavily engaged because you’re constantly bounding on the mid-sole of your feet. You’ll also use quads, hamstrings and glutes for power skills (like the double under.) Adding in different skills where you bound forward, backward or side-to-side as you jump, will also engage the smaller stabilizer muscles in your lower body.