Back in my best hockey shape I could jump rope for 1hr straight without hitting the rope once. My all time record was 2hrs and 2 mins. I only hit the rope twice in the last hr. My hr was only in the 130's. I would jump for 1hr before my tennis matches games to get loose. The trick is just jump high enuff the clear the thickness of the rope. When my rope wore out I made my own from a metal wire coated with plastic. My rope was short when stepping on the rope the handles came up to my hip bone. Never tried a leather speed rope or a heavy rope. I did my jumping not for cardio but for footwork.
NSCA, CSCS, NASM. PES, CES
305 for 15 REPS, 470 one rep max BENCH PRESS