We use the honor-system. We trust you and so does the rest of the community. Record your own time (start to finish) and see how your times stack up with others.
Courage
Sure, it's not easy. That's the point. Challenge yourself and push your limits!
Commitment
Once you start down this path, quitting isn't an option. Say it. "Quitting isn't an option." Now it's time to get some!