Recently, I went on a weekend hiking trip at the Grand Canyon with a small group of people and someone who very special to me. For many of us, it was our first hike to this particular campsite and we knew it would be a challenge. To get to the campsite and back, we had to hike 10-12 miles each way for a total of 20-24 miles. Additional hikes away from the campsite were 5-10 miles each way. It was a weekend full of walking. Hiking can be an intensive endeavor. As we walked through the canyon, much of the terrain consisted of sand or slippery rocks, and we often had to climb up or down in...