I was super short on time today, so I did a quick workout at home. I wanted to see how long it would take me to do 500 double unders. I did it in roughly 11 minutes. What was most interesting to me was that my limiting factor was arm and shoulder fatigue. My lungs and everything else felt great. I think I need to try to slow my speed a bit, even it out, and relax my upper body more.

I also switched my jump rope to one that was three inches shorter, which was helpful. I may go even shorter, but this one is definitely better than the last...still trying to find my perfect rope length.