I’m now developing a jump roping routine. 300 ump ropes this morning, yes. But now after that I add about 15 DOUBLE jumps. These are tough and build stamina. At first I couldn’t do even 5 double jumps. Now I’m up to 15. Florida is hot and stiffling. It’s easy to lose your wind because you’re suckingin dry hot air. And I had good wind, good stamina for the first half of my 8 mile run. The second half still needs work– the lst 4 miles still needs work. But I definitely think the jump roping is helping a lot.