I did a few workouts with a friend of mine who is a kickboxer, and he had me jumping rope a lot. I was AMAZED at how quickly I was winded and pooped out (well, I was way out of shape too). He had one that was weighted too, filled with water or gel or something. I think its the combo of the timing, arm movement and jumping that makes it work as well as it does. I doubt that simply jumping in place would be quite as beneficial.
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If you have any poo... fling it NOW!
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