Just when the pain of exercise shows up. You are faced with either crossing that threshold or ignoring it. For the gain is so rewarding. It pays not to sucumb to the mind saying it hurts, I can't go on. Life sometimes gives us these same options. We have to continue past that mind altering threshold, withstand some of the initial pain( with God on our side) knowing that in the end the gain will far outreach any uncomfortable pain induced thoughts of discouragement.