Jump rope is part of our routine HIIT exercises. While I have learned the basic moves (singles, running man, jack jumps, split step jumps) I still can not get the hang of double unders and probably never will.
My cardio endurance with jumping is far from where I'd like it to be. That's partly because my technique is not as smooth and efficient as it could be, but part is my high intensity endurance.
I have tried 1 lb ropes several times, for a minute at a time. These things really kick your ass, partly because of the upper body demands.
Weighted Jump Rope Vs. Speed Rope
Try a 1-lb rope sometime, or routinely. Just stick to singles. RX Smart Gear has the best ropes.