I am still waiting for a training in my area so I am experimenting it a lot.
I have seen in the DVD and in the Kranking web site that they use a scale like the % of max HR, my concern is how can you go at those number ?
We mostly use legs as cardio recruiter,I know that I still need to practice but anybody have any experience on that, any good RPE scale adapted to Kranking and upper body cardio.