In each pool assignment you are given a specific task to accomplish, under certain constraints. When you are no longer able to hold yourself within those constraints, you have reached a Failure Point.
In our training Failure is a friend, not an enemy. Failure reveals very important data about your skill and limitations. It is simply information, it is not a judgment.
For example, Harry has the task of holding 18 SPL and then gradually increasing his Tempo by -0.02 seconds on each round. He makes it several rounds, gradually increasing Tempo. But then he gets to a round where he can barely hold 18 SPL at that Tempo. He repeats the round again, and barely makes it. He increases Tempo by another -0.02 for the next round and he simply can’t do it now. The moment Harry can no longer hold 18 SPL consistently he has reached his Failure Point for the day. He would record that information, and move on to a new task or finish for the day.
This Failure Point is a sign that Harry needs give his brain and body time to rest and adapt. Then, when he picks up the same challenge the next practice he will see how his brain and body have prepared to handle this challenge better because of that rest time.
The challenge is to successfully accomplish the skill task (a quality), not just cover the assigned distance (a quantity). Distance is merely one variable among several that helps you measure improvement and quality. The purpose of the distance is to provide time and repetition to correct and imprint the skill. If the skill can no longer be controlled, there is no point in continuing to repeat out-of-control movement patterns. If you continue past that point, what will you be focusing on, and what will you be imprinting then? What you focus on is what your imprint.
Each practice should have some failure intentionally designed into it. When your tasks are carefully designed, you have a clear objective and you go right up to your failure point, and often step over it just a little to confirm that it is there.
Don’t leave this kind of intentional failure-as-a-tool out of your practice. It will help you understand your current position and weaknesses a great deal.