Is There a Limitation to the Normalized Graded Pace

The normalise graded pace has limits to it. It's not going to work on a super steep m trail where you 're hiking. The same with power the way. Is there a limitation in terms of, like, hiking, too slow? Too low of opium, too steep of a grade? Yes, essentially. So with an ultra, i run ultra marathons. A coach lot of ultra marithon runners. I'm going to use heart rate as the primary mitric because heart rate is going to be stable. And if it is being influenced by all these other a factors, like heat, humidity, then that is important. Within an ultra, you are going to