Hello everyone,
Recently I visited Grand Canyon National Park and traversed from North Rim to South Rim in one day. That is 24 miles, elevation change from 8,241 feet to 2,480 feet then back up to 6,860 feet. It was one heck a va hike. Below link is a youtube video I created with a Go Pro. First attempt at this. Please enjoy!
https://www.youtube.com/watch?v=zb_NHhLK6DY