Donald Miller rode his bike across the US with a group of guys. That's a bicycle just to be clear.
He shared this bit about a difficult stretch.
The day I remember most while crossing the the country was the day we rode through Joshua Tree. I got away from the group by perhaps thirty miles, and as the temperature broke a hundred degrees, I was forced to look for shade. The heat was coming up off the pavement like an oven. But there were no trees. After ten more miles, I found a metal shed next to a railroad track, and about six inches of shade landing on some concrete next to the shed. I laid my body down and put my head in the shade where there was a hot breeze swirling around. I just needed a break from the sun. I knew I had fifty more miles to go, and the miles would be, perhaps, the most miserable of my life. But in that place, I remembered about story, about how every conflict, no matter how hard, comes back to bless the protagonist if he will face his fate with courage. There is no conflict man can endure that will not produce a blessing. And I smiled. I'm not saying I was happy, but for some reason I smiled. It hurts now, but I'll love this memory, I thought to myself. And I do.