Mr. Somebody
Friend Of A Friend
Like others have said, jumping rope isn't the best form of cardio (although it is good sh!t) ..I think running sprints is the best. I always carry a rope with me to the gym. I try to mix up running on the treadmil, stair-stepper and jumping rope for cardio.
Its not the best form of cardio but it builds incredible muscular endurance in the legs. If you can jump rope for 20 minutes straight and barely mess up, you have good cardio and excellent endurance, friend.