Five minutes in, I wanted to quit. My feet hurt, I was out of breath, and my triceps were screaming. As an accountability coach, I help people push through moments like this all the time. But being the one in "the dark place"? That's different. That's when I remembered why having someone on the other end of the radio - someone who knows what you're up to and is waiting for your next update - makes all the difference between stopping and summiting.