Sean and I went to the South rim of the Grand Canyon and did a sunset hike down and back up. AMAZING. The weather was in the high 60's, but as soon as the sun went down, it dropped to about 30's-40's. We hiked down about 2 hours (loose, dusty dirt, really need to look where you are going!!)
And about 1 hour back up. The way back up felt much better on my hip because I was really working it,
using all my hip and leg muscles. I was even running for the shuttle bus after the climb cause it was the last one of the evening. I was very happy and pain free.