Because it increases your heart rate.
Cardio ... And hand-eye coordination
Skipping rope is good for burning calories, weight loss.
So make your muscle by this good exercise.
According to me it is the best exercise since it helps in losing weight.
Its good for your legs.
Very few exercises burn calories like jump rope. Even jumping at a very moderate rate burns 10 to 16 calories a minute. Work your jump rope exercise into three 10-minute rounds and you're looking at 480 calories in half an hour.
Increases heartrate, sufficient movement, entertaining.. All that jazz