Real world it goes back to the old school thing with Ned Overend & Tinker Juarez on stand up climbing versus seated. Your heartrate while seated climing is an average of 10 beats slower and efficiency over distance is not just cumulative, but has an exponential effect where you're less fatigued at the same speed. I equate flats and clips to that, but with something in the range of 100,000 variables that can raise your heart beat once you throw in a trail. If you're clipped in, you're using entirely different muscle group firings than on flats. You're running your...