" Where most friends would say, “Poor baby,” running friends say, “You’re being a baby.” Where most friends offer gentle encouragement, running friends talk smack. Running buddies celebrate the best, tolerate the worst, and pretend not to notice the embarrassing. They’re a vault for the secrets that we share on the trail, when we’re hungry, hot, and way too tired to be anything but 100 percent real. And when someone asks, “Would it be a horrible idea if . . . ?” the running buddy’s answer is always, “Yes. What time?” A running buddy sees your limitless potential and will happily act as a mirror until you see it, too. "

― Susan Lacke , Running Outside the Comfort Zone: An Explorer's Guide to the Edges of Running